Add rbac_utils is_admin helper method

This patch adds a helper method to rbac_utils.RbacUtils called
``is_admin`` which returns True if the current RBAC test role
is equal to the admin role defined in tempest.conf (i.e.
CONF.rbac.rbac_test_role == CONF.identity.admin_role). This
makes it easier to check this equivalence in a test by simply
running:

    if self.rbac_utils.is_admin:
        do something

Change-Id: I0efb005f90ac77449453f6b68a010ec64e7a03f7
diff --git a/patrole_tempest_plugin/rbac_rule_validation.py b/patrole_tempest_plugin/rbac_rule_validation.py
index c63ef90..ba04a30 100644
--- a/patrole_tempest_plugin/rbac_rule_validation.py
+++ b/patrole_tempest_plugin/rbac_rule_validation.py
@@ -81,7 +81,7 @@
                 LOG.info("As admin_only is True, only admin role should be "
                          "allowed to perform the API. Skipping oslo.policy "
                          "check for policy action {0}.".format(rule))
-                allowed = CONF.rbac.rbac_test_role == CONF.identity.admin_role
+                allowed = test_obj.rbac_utils.is_admin
             else:
                 allowed = _is_authorized(test_obj, service, rule,
                                          extra_target_data)