Updated openstack/openstack
Project: openstack/neutron  becc721155d934899aa512a7e59181fd0ee6f590

Don't explicitly call .stop() on mock.patch objects

BaseTestCase already cleans up all mocks via .stopall(), so there is no
need to do it in each test case.

Change-Id: I7165ea9682a3dce3a76e90e309b763c939729d84