Add V2 user roles tests
Add V2 user roles tests

The cross over between the user manager and the role manager is not
tested. As this will be changed soon re-enforce the current behaviour.

Change-Id: I3f8d8215a10cf09cfaad57ffa359f36d0417fb31

Mercador/python-keystoneclient,magic0704/python-keystoneclient,sdpp/python-keystoneclient,darren-wang/ksc,Mercador/python-keystoneclient,sdpp/python-keystoneclient,darren-wang/ksc,alexpilotti/python-keystoneclient,klmitch/python-keystoneclient,klmitch/python-keystoneclient,ging/python-keystoneclient,magic0704/python-keystoneclient,ging/python-keystoneclient,alexpilotti/python-keystoneclient