docker daemon ipv6 support

[fahedouch]

hello,

GA seems to supports ipv6 in docker daemon. before merging this PR #127

we should fix TestContainerInspectContainsPortConfig test by adding a condition on the binary or skipping it

[AkihiroSuda]

Unrelated to this repo?

[fahedouch]

in the CI i got this

=== RUN   TestContainerInspectContainsPortConfig
    container_inspect_test.go:39: assertion failed: {"80/tcp":[{"HostIp":"0.0.0.0","HostPort":"8080"}]} (expected string) != {"80/tcp":[{"HostIp":"0.0.0.0","HostPort":"8080"},{"HostIp":"::","HostPort":"8080"}]} (string)

I think we should skip this test until merging this PR #127

[AkihiroSuda]

#185