Updated openstack/openstack
Project: openstack/nova  0afdcedc3897301ff14c6eefb7355964825c1c12
null
Prevent caller from specifying id during Aggregate.create()

The patch is to remove id when it was set before creating an aggregate
in objects, and check if the aggregate exists before it is created.

Related to blueprint icehouse-objects.

Change-Id: I0d7c5c5da9a93e52c7fee9eee7df80d2f460593e