Update plugin.py

Corrects get_opt_lists to correctly return registered opts for
Patrole.

Change-Id: Ie789a70bfc194b2a783f88ad035bba5119b8953b
Closes-Bug: #1694811
diff --git a/patrole_tempest_plugin/plugin.py b/patrole_tempest_plugin/plugin.py
index cfe5c0a..28ce12c 100644
--- a/patrole_tempest_plugin/plugin.py
+++ b/patrole_tempest_plugin/plugin.py
@@ -36,4 +36,4 @@
             project_config.RbacGroup)
 
     def get_opt_lists(self):
-        return []
+        return [(project_config.rbac_group.name, project_config.RbacGroup)]