update docker dependency to 21.xx-dev (master), and update to go 1.16 #104
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hack/dockerfiles: switch to syntax dockerfile/1.2
hack/dockerfiles: use GO_VERSION for linter and go mod validation
This allows the version to be set through a build-arg, and makes sure that the linter lints on the expected go version.
Note that go mod results may differ between go versions. If this becomes a problem, we should use a fixed version for that validation (added a comment in the bakefile).
Update default go version to 1.16
go.mod: github.com/containerd/contiunity v0.1.0
full diff: containerd/continuity@968621f...v0.1.0
go.mod: update docker to master (v21.xx-dev), post-libnetwork integration