Updated openstack/openstack
Project: openstack/nova  90cf9f654238b138f96ae67897e707a37e71beae

Turn periodic tasks off in all unit tests

We shouldn't rely on periodic tasks to randomly run in unit tests,
instead if we need them to run we should explicitly call them out.

Change-Id: I35850c47288e50d3146771dc7a9a54d62e36c3cf
Related-Bug: 1311778