remove set_flags_verbosity.. it's not needed

nova/test.py

@@ -156,11 +156,6 @@ class TestCase(unittest.TestCase):
         FLAGS.Reset()
         for k, v in self._original_flags.iteritems():
             setattr(FLAGS, k, v)
-        FLAGS.verbose = self._original_flags_verbosity
-
-    def set_flags_verbosity(self, verbose=True):
-        """Set the FLAGS verbosity for a test"""
-        FLAGS.verbose = verbose
 
     def start_service(self, name, host=None, **kwargs):
         host = host and host or uuid.uuid4().hex