Updated openstack/openstack
Project: openstack/nova  c85a17447e54ebba192c0dcab1222760319cbe46
null
Make instance_exists() take an instance, not instance_name

Some virt drivers may not support/need to use instance.name and have
a different way to find out if an instance exists. NOTE: this still
uses dict access on instance, as the _run_instance() path is not
converted to Instance objects yet.

NOTE: This also removes a duplicate call to self._lookup_by_name()
in libvirt's resume_state_on_host_boot(). It was calling
self.instance_exists() and then self._lookup_by_name(), but instance_exists()
calls _lookup_by_name() itself.

Change-Id: I701cb5416ec47262268d1a088018b6be2774d1c5