Update requirements.txt and test-requirements.txt

Change-Id: I9c60d1d9097d35aa7c3d44168e370a9f30fd6621
Merge "Update requirements.txt and test-requirements.txt"
Update tox.ini for new tox 1.6 config

Change-Id: I4363508f562f62b16c856bc072cdb4b37e37b418
Refactor fake data for projects and users

* Move fake data structures into tests/identity/fakes.py
* Use fake clients correctly and support multiple client versions

Change-Id: Icacbb2ca740b63937bd2c4442af61b620638b53e
Add Identity v2 role and service tests

* Add current auth info (auth_ref) to ClientManager
* Fix identity.v2_0.role.ListUserRole to get default user/project
  from ClientManager.auth_ref
* Fix identity.v2_0.role.AddRole call to roles.add_user_role()

Change-Id: Ie8bf41c491d97b0292a2b86bdc9b7580989a7f97
Merge "Update tox.ini for new tox 1.6 config"