Updated openstack/openstack
Project: openstack/nova  02a2790fac46b7ae1bbbd6c580c5dc38c5a42854
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Accurate comment in compute layer

Currently instance usually refer to an object instead of a dict
but comments didn't update in compute, this patch update it.

Change-Id: I7902f09b21c951c1e7a9d32a75b3c75208fb6d86