[r=jameinel],[bug=1226996] panic if we get bad requests
It turns out that if you don't supply CIDR or GroupId Openstack just
sets CIDR to 0.0.0.0/0. We don't want to rely on that behavior, so
this just changes the goose test double to panic if it got that
situation.
This can't land until we land my updated Juju branch (or the test
suite will appropriately fail with panic().)
https://codereview.appspot.com/13781043/