[pkg-go] docker-libkv is marked for autoremoval from testing

[Debian testing autoremoval watch]

docker-libkv 0.2.1-1 is marked for autoremoval from testing on 2019-07-11

It (build-)depends on packages with these RC bugs:
865975: docker.io: docker.io changes iptables default FORWARD policy to DROP, breaks VM and others
929662: docker.io: CVE-2018-15664
930302: docker.io: docker.io changes iptables default FORWARD policy to DROP, breaks VM and others