Updated openstack/openstack
Project: openstack/nova  fbc678668442e3d29593a17ab5351b7358f37788

xenapi: reorder volume_utils

Grouping related functions together. Renamed _create_pbd to show it is
not called outside volume_utils.

Change-Id: If6106a81d58e059e2e683ad0556d4225a9b894e2