[pkg-go] golang-github-samalba-dockerclient is marked for autoremoval from testing

[Debian testing autoremoval watch]

golang-github-samalba-dockerclient 0.0~git20160531.0.a303626-2 is marked for autoremoval from testing on 2019-02-20

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]