[WFLY-490] reorganized imports according to WildFly coding standard
[WFLY-490] renamed variables after ControlFlag removal
[WFLY-490] de-ignore MultipleRolesBasicRbacTestCase
[WFLY-490] added one TODO to OperationContextImpl (missing 'authorize' call IMHO)
[WFLY-490] move testing utils from BasicRbacTestCase to AbstractRbacTestBase
[WFLY-490] added a detailed test case for invoking restricted operations
[WFLY-490] replacted a TODO with a proper comment