Comment 17 for bug 1348663

The specific call to lxc-stop for a "remove-machine" on a container is (logging output):
machine-0: 2015-05-06 22:49:10 WARNING golxc.stop golxc.go:278 lxc-stop [--name juju-machine-0-lxc-0]

Still trying to confirm this *should* do ifdown which should release the lease. Will try manually with a new container on the machine to see.