[ONOS-6901] Fix how the systemTest does not return any result when it forced to quit the test

Change-Id: If93c48d46e8dc2494046b42de21f732775d7f520
diff --git a/TestON/tests/FUNC/FUNCgroup/dependencies/group-bucket.py b/TestON/tests/FUNC/FUNCgroup/dependencies/group-bucket.py
index b143fdb..7b8ded6 100644
--- a/TestON/tests/FUNC/FUNCgroup/dependencies/group-bucket.py
+++ b/TestON/tests/FUNC/FUNCgroup/dependencies/group-bucket.py
@@ -48,5 +48,4 @@
         return None
     except Exception:
         main.log.exception( self.name + ": Uncaught exception!" )
-        main.cleanup()
-        main.exit()
+        main.cleanAndExit()