this PR adds a network_isolation config option for trove,
with network_isolation enabled, trove guest agent will
plug the user-defined port to database container by
docker host_nic network driver which is implemented in this PR.
docker host_nic network driver is a simple driver to plug host
nic to a container. this driver supports ipv4,ipv6 and dual-stack.
for more details please see the story.
story: 2010733
task: 47957
Change-Id: I35d6f8b81a2c5e847cbed3f5bc6095dc1d387165
2f755b64b3