Fix client fixtures
Fix client fixtures

Some of the client fixtures used for testing were invalid. v2
tokens must have 'access'/'token'/'expires', and v3 tokens must
have 'token'/'expires_at'.

Change-Id: I2614c7deed47c9758c2031418110108308634296
Related-Bug: #1174499

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