Updated openstack/openstack
Project: openstack/nova  58b8a68f3c0821008d42328061c2ca35de98c4ec

Correct InvalidAggregateAction reason for Xen

Currently the xenapi will report InvalidAggregateAction
when add aggreate under some conditions. But the reason
didn't use the pre-defined reason list.

Change-Id: I2cd65f26097f154f1a4f794916c74cd1730ae142