Few additional tests for RBAC 

Here are the tests for:

- https://issues.jboss.org/browse/WFLY-2274
- https://issues.jboss.org/browse/WFLY-2190 (discovered https://issues.jboss.org/browse/WFLY-2317 with that)
- https://issues.jboss.org/browse/WFLY-2270