Do not manage ipv6 for host mode containers
Do not manage ipv6 for host mode containers

Signed-off-by: Alessandro Boch <5bd2eb5b6f60921d9a2b9cb6a0a86bb947f3d361@docker.com>

kolyshkin/libnetwork,allencloud/libnetwork,ityangchen/libnetwork,kolyshkin/libnetwork,abhi/libnetwork,medallia/libnetwork,WeiZhang555/libnetwork,abhi/libnetwork,mahak/libnetwork,vdemeester/libnetwork,vdemeester/libnetwork,medallia/libnetwork,docker/libnetwork,ityangchen/libnetwork,abhi/libnetwork,docker/libnetwork,kolyshkin/libnetwork,vdemeester/libnetwork,mahak/libnetwork,allencloud/libnetwork,docker/libnetwork,WeiZhang555/libnetwork,fcrisciani/libnetwork,mahak/libnetwork,medallia/libnetwork,fcrisciani/libnetwork