Comment 16 for bug 1348663

In the graceful shutdown case we should be calling lxcBroker.StopInstances() which calls manager.DestroyContainer(id) which goes to golxc cotnainer.Stop() which *does* call lxc-stop (without the -k). So we *should* see DHCP release (according to comments earlier in this bug). Adding some logging to confirm this is really called.