Updated openstack/openstack
Project: openstack/nova  d59b2851757611be4c455252655b412649150632

make get_by_host use slave in periodic task

In periodic task functions nova prefer to use slave db
instead of primary db. This patch makes function
_get_host_volume_bdms to use slave db

Change-Id: Ia297524fc1acf06ab708509c805d14e215b10b86