Updated openstack/openstack
Project: openstack/nova  373d839753fc17c4bdab30668aa7cdd0dffcf4f6

Get EC2 snapshot mappings with nova object

Use the EC2SnapshotMapping nova object for getting the mapping instead
of directly using the db API.

Part of blueprint convert-ec2-api-to-use-objects

Change-Id: I258ffe0a3fe3b0d7b2524bb64f1137127731bdd5