auth_token test remove unused fake_app parameter
auth_token test remove unused fake_app parameter

set_middleware is never called with fake_app, so remove it.

Change-Id: Id4541f77a12a9d43f2761f8d1fd14d633f6944ac

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