code: def revoke_user(self, user_id):
          
  
          uri = 'openstack/users/%s' % user_id
          try:
              resp = self.delete(uri)
          except AttributeError:
              # note: this breaks. stacktask returns a string, not json.
              return
          self.expected_success(200, resp.status)
          return rest_client.ResponseBody(resp, None)
docs: Revoke a user from the tenant
              This will remove pending or approved roles but
              will not not delete the user from Keystone.