Updated openstack/openstack
Project: openstack/nova  ec9d5b61d93899b750644fe2f5099e8d692f6df6

Fix usage of BandwidthUsage.create()

The _poll_bandwidth_usage periodic task was attempting to use
BandwidthUsage as a classmethod even though it is not defined as a
classmethod.  It has been updated to be used properly and a test was
added to ensure there is no error.

Change-Id: I96709675a952857da5121da29acd1ab2e6726fd0
Closes-Bug: #1392423