Updated openstack/openstack
Project: openstack/nova  848b34477cd85b213ea2fc8355c09e8f1d9d7bb5

Add VolumeMapping object for use in EC2

The EC2 code has a table mapping volume UUIDs to EC2 IDs.  This patch
creates the Nova object for this so that we can remove direct use of
these db.api calls from the EC2 code.

Change-Id: I80e5d9c8e33c1f0c5ef8a9f7c54935c8c329ed25