Updated openstack/openstack
Project: openstack/nova  397780e24c2d413f5b50a6c3b4558fd7de1e5f19

Add instance_group_get_by_instance to db.api

Add a new method to the db.api that lets you get an instance group by
instance UUID.

Change-Id: I3d2a019c8f97166ec55574c610d12f572afb2bd1
Related-bug: #1379451