docs: def guest_stop(self, userid, **kwargs):
          """Power off VM."""
          requestData = "PowerVM " + userid + " off"
  
          if 'timeout' in kwargs.keys() and kwargs['timeout']:
              requestData += ' --maxwait ' + str(kwargs['timeout'])
          if 'poll_interval' in kwargs.keys() and kwargs['poll_interval']:
              requestData += ' --poll ' + str(kwargs['poll_interval'])
  
          with zvmutils.log_and_reraise_smt_request_failed():
              self._request(requestData)