Updated openstack/openstack
Project: openstack/nova  1460e5e133ee7b1d49aecec0a101318cc97e8229

Move to oslo.db

Replace common oslo code nova.openstack.common.db by usage
of oslo.db library and remove common code.

Replaced catching of raw sqlalchemy exceptions by catches
of oslo.db exceptions(such as DBError, DBDuplicateEntry, etc).

Co-Authored-By: Eugeniya Kudryashova  <ekudryashova@mirantis.com>

Closes-Bug: #1364986
Closes-Bug: #1353131
Closes-Bug: #1283987
Closes-Bug: #1274523
Change-Id: I0649539e071b2318ec85ed5d70259c949408e64b