Updated openstack/openstack
Project: openstack/horizon  17e5f37aa8aae5b0d660f7a4468977e5f8243d5b
null
Change assertTrue(isinstance()) by optimal assert

Some of tests use different method of assertTrue(isinstance(A, B)) or
assertEqual(type(A), B). The correct way is to use assertIsInstance(A,
B) provided by testtools.

Change-Id: I5e7afcdc7be36e64168ef850749dfcb5a19e784a
Closes-Bug: #1268480