Updated openstack/openstack
Project: openstack/nova  bd71677d128c8f3d78e5c6772dded96ff470f229
null
Move _poll_volume_usage periodic task to BDM objects

This patch makes the _poll_volume_usage compute service periodic task
use BDM objects internally. It also moves a single instance query to
objects as a side effect. Also adds a missing test for the manager
helper method _get_host_volume_bdms.

Part of blueprint: icehouse-objects

Change-Id: I085fddfbe5872c0b2b044106c0d2507fd4ee32d8