Updated openstack/openstack
Project: openstack/nova  048acce50a75331c68abc2aa16ef367c3b91de6c

Remove unused db api methods

Remove methods that are no longer used from the db API.  New methods
were created that replaced these when the EC2SnapshotMapping object
was created in earlier commits.

Related to blueprint convert-ec2-api-to-use-nova-objects

Change-Id: I5431dd34d6a3fcea687b9d8f192a822e83ed9402