Initial github actions and misc. housekeeping items

This change introduces initial github actions. Also included are
basic liniting, licensing, code of conduct, and other boilerplate
items for the repository.

See #1

.github/workflows/ci.yaml

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+---
+name: ci
+on: pull_request
+jobs:
+  yamllint:
+    name: yamllint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v1
+      - name: Setup Python
+        uses: actions/setup-python@v1
+      - name: Install yamllint
+        run: pip install --user yamllint
+      - name: Run yamllint
+        run: ~/.local/bin/yamllint -c .yamllint.yml --strict .
+  shellcheck:
+    name: shellcheck
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: shellcheck
+        uses: reviewdog/action-shellcheck@v1
+        with:
+          github_token: ${{ secrets.github_token }}
+          reporter: github-check
+  build:
+    name: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-go@v1
+        with:
+          go-version: 1.13
+      - run: |
+          go build -race ./...
+  test:
+    name: test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-go@v1
+        with:
+          go-version: 1.13
+      - name: Install gotestsum
+        run: go get gotest.tools/gotestsum@v0.4.0
+      - name: Run tests
+        run: |
+         eval $(go env)
+         mkdir -p ~/junit/
+         ${GOPATH}/bin/gotestsum --junitfile ~/junit/unit-tests.xml -- -race -short $(go list ./...)
+  golangci-lint:
+    name: golangci-lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v1
+      - name: golangci-lint
+        uses: reviewdog/action-golangci-lint@v1
+        with:
+          github_token: ${{ secrets.github_token }}
+          reporter: github-check
+
+  excludeFmtErrorf:
+    name: exclude fmt.Errorf
+    runs-on: ubuntu-latest
+    steps:
+      - name: Exclude fmt.Errorf
+        run: |
+          if grep -r --include=*.go fmt.Errorf . ; then
+           echo "Please use errors.Errorf (or errors.New or errors.Wrap or errors.Wrapf) as appropriate rather than fmt.Errorf"
+           exit 1
+          fi
+  restrictNSMDeps:
+    name: Restrict dependencies on github.com/networkservicemesh/*
+    runs-on: ubuntu-latest
+    steps:
+      - name: Restrict dependencies on github.com/networkservicemesh/*
+        run: |
+          for i in $(grep github.com/networkservicemesh/ go.mod | gsed 's;.*\(github.com\/networkservicemesh\/[a-zA-z\/]*\).*;\1;g' | sort -u);do
+            if [ "${i}" != "github.com/networkservicemesh/sdk" ] && [ "${i}" != "github.com/networkservicemesh/networkservicemesh/controlplane/api" ]; then
+              echo Dependency on "${i}" is forbidden
+              exit 1
+            fi
+          done
+  checkgomod:
+    name: check go.mod and go.sum
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-go@v1
+        with:
+          go-version: 1.13
+      - run: go mod tidy
+      - name: Check for changes in go.mod or go.sum
+        run: |
+          git diff --name-only --exit-code go.mod || ( echo "Run go tidy" && false )
+          git diff --name-only --exit-code go.sum || ( echo "Run go tidy" && false )
+  license:
+    name: license header check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-go@v1
+        with:
+          go-version: 1.13
+      - name: Install go-header
+        run: 'go get github.com/denis-tingajkin/go-header@v0.2.1'
+      - name: Run go-header
+        run: |
+          eval $(go env)
+          ${GOPATH}/bin/go-header

.github/workflows/pr-for-updates.yaml

@@ -0,0 +1,18 @@
+
+---
+name: Pull Request on update/* Branch Push
+on:
+  push:
+    branches:
+      - update/*
+jobs:
+  auto-pull-request:
+    name: Pull Request on update/* Branch Push
+    runs-on: ubuntu-latest
+    steps:
+      - name: pull-request-action
+        uses: vsoch/pull-request-action@master
+        env:
+          GITHUB_TOKEN: ${{ secrets.NSM_BOT_GITHUB_TOKEN }}
+          BRANCH_PREFIX: "update/"
+          PULL_REQUEST_BRANCH: "master"

.go-header.yaml

@@ -0,0 +1,16 @@
+---
+year: 2020
+goroutine-count: 6
+scope:
+  policy: "diff"
+  master-branch: "origin/master"
+rules:
+  - template-path: ".license/template.txt"
+    paths:
+      - ".*[.]go$"
+    exclude-paths:
+      - ".*[.]pb"
+custom-patterns:
+  - name: NSM COPYRIGHT HOLDERS
+    pattern: "Copyright (c) {YEAR} {COPYRIGHT HOLDER}"
+    separator: "\n//\n// "

.golangci.yaml

@@ -0,0 +1,158 @@
+---
+run:
+  # concurrency: 6
+  timeout: 1m
+  issues-exit-code: 1
+  tests: true
+linters-settings:
+  errcheck:
+    check-type-assertions: false
+    check-blank: false
+  govet:
+    check-shadowing: true
+    settings:
+      printf:
+        funcs:
+          - (github.com/sirupsen/logrus.FieldLogger).Infof
+          - (github.com/sirupsen/logrus.FieldLogger).Warnf
+          - (github.com/sirupsen/logrus.FieldLogger).Errorf
+          - (github.com/sirupsen/logrus.FieldLogger).Fatalf
+  golint:
+    min-confidence: 0.8
+  goimports:
+    local-prefixes: github.com/networkservicemesh/sdk-kernel/
+  gocyclo:
+    min-complexity: 15
+  maligned:
+    suggest-new: true
+  dupl:
+    threshold: 150
+  goconst:
+    min-len: 2
+    min-occurrences: 2
+  depguard:
+    list-type: blacklist
+    include-go-root: false
+    packages:
+      - errors
+    packages-with-error-message:
+      # specify an error message to output when a blacklisted package is used
+      - errors: "Please use \"github.com/pkg/errors\" instead of \"errors\" in go imports"
+  misspell:
+    locale: US
+  unparam:
+    check-exported: false
+  nakedret:
+    max-func-lines: 30
+  prealloc:
+    simple: true
+    range-loops: true
+    for-loops: false
+  gocritic:
+    enabled-checks:
+      - appendAssign
+      - assignOp
+      - appendCombine
+      - argOrder
+      - badCall
+      - badCond
+      - boolExprSimplify
+      - builtinShadow
+      - captLocal
+      - caseOrder
+      - codegenComment
+      - commentFormatting
+      - commentedOutCode
+      - commentedOutImport
+      - defaultCaseOrder
+      - deprecatedComment
+      - docStub
+      - dupArg
+      - dupBranchBody
+      - dupCase
+      - dupImport
+      - dupSubExpr
+      - elseif
+      - emptyFallthrough
+      - emptyStringTest
+      - equalFold
+      - evalOrder
+      - exitAfterDefer
+      - flagDeref
+      - flagName
+      - hexLiteral
+      - hugeParam
+      - ifElseChain
+      - importShadow
+      - indexAlloc
+      - initClause
+      - methodExprCall
+      - nestingReduce
+      - newDeref
+      - nilValReturn
+      - octalLiteral
+      - offBy1
+      - paramTypeCombine
+      - ptrToRefParam
+      - rangeExprCopy
+      - rangeValCopy
+      - regexpMust
+      - regexpPattern
+      - singleCaseSwitch
+      - sloppyLen
+      - sloppyReassign
+      - stringXbytes
+      - switchTrue
+      - typeAssertChain
+      - typeSwitchVar
+      - typeUnparen
+      - unlabelStmt
+      - unnamedResult
+      - unnecessaryBlock
+      - underef
+      - unlambda
+      - unslice
+      - valSwap
+      - weakCond
+      - wrapperFunc
+      - yodaStyleExpr
+linters:
+  disable-all: true
+  enable:
+    # - rowserrcheck
+    - bodyclose
+    - deadcode
+    - depguard
+    - dogsled
+    - dupl
+    - errcheck
+    - funlen
+    - gochecknoinits
+    - goconst
+    - gocritic
+    - gocyclo
+    - gofmt
+    - goimports
+    - golint
+    - gosec
+    - gosimple
+    - govet
+    - ineffassign
+    - interfacer
+    # - lll
+    - misspell
+    - nakedret
+    - scopelint
+    - staticcheck
+    - structcheck
+    - stylecheck
+    - typecheck
+    - unconvert
+    - unparam
+    # - unused
+    - varcheck
+    - whitespace
+issues:
+  exclude-use-default: false
+  max-issues-per-linter: 0
+  max-same-issues: 0

.license/README.md

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+## Copyright headers for source code
+This folder contains the copyright templates for source files of NSM project.
+
+Below is an example of valid copyright header for `.go` files:
+```
+// Copyright (c) 2020 Doc.ai and/or its affiliates.
+//
+// Copyright (c) 2020 Cisco and/or its affiliates.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at:
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+```
+Note you can use your company name instead of `Cisco and/or its affiliates`.
+Also, source code files can have multi copyright holders, for example:
+```
+// Copyright (c) 2020 Doc.ai and/or its affiliates.
+//
+// Copyright (c) 2020 Cisco and/or its affiliates.
+//
+// Copyright (c) 2020 Red Hat Inc. and/or its affiliates.
+//
+// Copyright (c) 2020 VMware, Inc.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at:
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+```

.license/boilerplate.txt

@@ -0,0 +1,19 @@
+// Copyright (c) 2020 Doc.ai and/or its affiliates.
+//
+// Copyright (c) 2020 Cisco and/or its affiliates.
+//
+// Copyright (c) 2020 VMware, Inc.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at:
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.

.license/template.txt

@@ -0,0 +1,15 @@
+// {NSM COPYRIGHT HOLDERS}
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at:
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.