Updated openstack/openstack
Project: openstack-infra/devstack-gate  9e06327193e2aa23b488c3c566f13acd3f03de87
null
Bump grenade master to use stable/havana.

Now that we have cut Havana it is time to move on and use
it (instead of Grizzly) for forward facing Icehouse testing.

This is holding up Nova migration compaction at the moment.

Change-Id: Ib64dafbd3aeb968fb71752a5a26fad105045f5f8