Updated openstack/openstack
Project: openstack/nova  173b850f06cc1f6ad81f4ff2439ffc6f927da45b

ec2utils: Use VolumeMapping object

Update ec2utils to use the VolumeMapping object instead of direct db
API calls for getting the ec2 ID to UUID mappings.

Change-Id: Id653fc16fffc1c416379087228a0b053b8868cac