Users RBAC test for Keystone API v2 users

- users rbac testing migrated from tempest rbac
- dependent on change 433866 merge

Partially-Implements bp: initial-tests-identity
Co-Authored-By: Cliff Parsons <cp779u@att.com>

Change-Id: I47a84915e2470f76583cf9f9ca63a7b5a313f3a8
1 file changed