Some development dependencies are not versioned

[AlekSi]

What did you do?

git checkout dev-2.0
scripts/genproto.sh
git status

What did you expect to see?

nothing to commit, working tree clean

What did you see instead? Under which circumstances?

Changes not staged for commit:
	modified:   documentation/dev/api/swagger.json
	modified:   prompb/rpc.pb.go
	modified:   prompb/rpc.pb.gw.go
	modified:   prompb/types.pb.go

This script uses https://github.com/gogo/protobuf and https://github.com/grpc-ecosystem/grpc-gateway from GOPATH, they are not vendored. This means that every contributor who touches that part (like me) will create a different version of generated files. The changes are not trivial.

I propose to vendor those dependencies and use them. What do you think?

[brian-brazil]

Those dependencies have disto and arch specific non-Go dependencies themselves, so I don't think it's possible to vendor them.

[AlekSi]

Well, protoc version is checked by genproto.sh script. What else?