New "netlink" package, moved from libcontainer

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>
Move network initialization to network package

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>
Merge remote-tracking branch 'remotes/LK4D4/new_brave_network' into extensions

Conflicts:
	daemon/daemon.go