Updated openstack/openstack
Project: openstack/oslo-incubator  64529f856c4fe361d55c1736a8433db4d8901fe8

Do not incur the cost of a second method call

The usage of dict.get here is unnecessary since dict.setdefault will
not override an existing value.

Change-Id: Ie1b360cc7dd657aafda9f7d9de6c87cdf6c3f97d