Trivial: Replace 'assertTrue(a in b)' with 'assertIn(a, b)'
Trivial: Replace 'assertTrue(a in b)' with 'assertIn(a, b)'

Change-Id: Ie9d6a30d68c386f8c35dfd9f3c947f77d534bb8e

openstack/sahara-tests,openstack/sahara-tests,openstack/sahara-scenario,openstack/sahara-tests,openstack/sahara-scenario,openstack/sahara-tests,openstack/sahara-scenario