Updated openstack/openstack
Project: openstack/oslo.messaging  f1188307b6900e69d504d39690e7566580aa50c9
null
Use stevedore's make_test_instance

Replace the use of TestManager with make_test_instance
to get an instance of the type of manager expected.
The old TestManager class is deprecated

Change-Id: I717c0296bf8ae07b1dad8f0045bfe12c8620ad0a
Partial-bug: #1273455