Updated openstack/openstack
Project: openstack/python-ceilometerclient  c0497d801190aa9788627e3ae7cbda7fac4a0f99
null
replace assertTrue(isinstance) to assertIsInstance

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: Idd931d27b13a46800e27393a98da096d41442320
Closes-bug: #1268480