[pkg-go] umoci is marked for autoremoval from testing

[Debian testing autoremoval watch]

umoci 0.4.0+dfsg-1 is marked for autoremoval from testing on 2019-01-27

It is affected by these RC bugs:
917595: umoci: FTBFS (cannot find package "github.com/fatih/color")

It (build-)depends on packages with these RC bugs:
918618: golang-github-grpc-ecosystem-grpc-gateway: golang-github-grpc-ecosystem-grpc-gateway FTBFS: github.com/grpc-ecosystem/grpc-gateway/runtime [build failed]