Moving Storage to an Independent Repository (Azure#556)

* Updating CI to use Go 1.8.

Go 1.8 was released on Thursday, February 16th. Many of our partners
have adopted and we need to ensure that we support the most recent
version.

* Replacing storage folder with submodule.

In order to allow for more independent growth of the storage package,
we've given it its own repository. This change updates the main
repository to use a submodule in order to prevent breaking changes for
folks using storage today who do not want to migrate to the new
repository.

* Updating submodule target URL.

There is an existing naming convention for Azure Storage repositories.
the repo has been updated to match that convention, this updates the
submodule to point to the new URL.

* Responding to review feedback.

* Updating submodule to ref v8.1.0 storage version.

.gitmodules

@@ -0,0 +1,4 @@
+[submodule "storage"]
+	path = storage
+	url = https://github.com/Azure/azure-storage-go
+	branch = v0.1.0

.travis.yml

@@ -2,7 +2,7 @@ sudo: false
 
 language: go
 
-go: 1.7
+go: 1.8
 
 install:
   - go get -u github.com/golang/lint/golint
@@ -16,14 +16,10 @@ script:
   - bash rungas.sh
   - test -z "$(gofmt -s -l $(find ./arm/* -type d -print) | tee /dev/stderr)"
   - test -z "$(gofmt -s -l -w management | tee /dev/stderr)"
-  - test -z "$(gofmt -s -l -w storage | tee /dev/stderr)"
   - test -z "$(gofmt -s -l -w Gododir | tee /dev/stderr)"
-  - test -z "$(go build $(find ./* -type d -print | grep -v '^./vendor$') | tee /dev/stderr)"
+  - test -z "$(go build $(find ./* -type d -print | grep -v '^./vendor$' | grep -v '^./storage$') | tee /dev/stderr)"
   - test -z "$(go vet $(find ./arm/* -type d -print) | tee /dev/stderr)"
   - test -z "$(golint ./arm/... | tee /dev/stderr)"
-  - go test -v ./storage/... -check.v
-  - test -z "$(golint ./storage/... | tee /dev/stderr)"
-  - go vet ./storage/...
   - go test -v ./management/...
   - test -z "$(golint ./management/... |  grep -v 'should have comment' | grep -v 'stutters' | tee /dev/stderr)"
   - go vet ./management/...

Gododir/gen.go

@@ -463,15 +463,15 @@ func initAndAddService(service *service, inputPrefix, plane string) {
 }
 
 func tasks(p *do.Project) {
-	p.Task("default", do.S{"setvars", "generate:all", "storage"}, nil)
+	p.Task("default", do.S{"setvars", "generate:all", "management"}, nil)
 	p.Task("setvars", nil, setVars)
 	p.Use("generate", generateTasks)
 	p.Use("gofmt", formatTasks)
 	p.Use("gobuild", buildTasks)
 	p.Use("golint", lintTasks)
 	p.Use("govet", vetTasks)
 	p.Use("delete", deleteTasks)
-	p.Task("storage", do.S{"setvars"}, storageVersion)
+	p.Task("management", do.S{"setvars"}, managementVersion)
 }
 
 func setVars(c *do.Context) {
@@ -507,7 +507,7 @@ func generate(service *service) {
 		"-OutputDirectory", service.Output,
 		"-Modeler", "Swagger",
 		"-pv", sdkVersion,
-		"-SkipValidation",
+		"-SkipValidation")
 	autorest.Dir = filepath.Join(autorestDir, "autorest")
 	err = runner(autorest)
 	if err != nil {
@@ -584,8 +584,12 @@ func vet(service *service) {
 	}
 }
 
-func storageVersion(c *do.Context) {
-	versionFile := "storage/version.go"
+func managementVersion(c *do.Context) {
+	version("management")
+}
+
+func version(packageName string) {
+	versionFile := filepath.Join(packageName, "version.go")
 	os.Remove(versionFile)
 	template := `package storage