docs: def execute_cmd(self, userid, cmdStr):
          """"cmdVM."""
          requestData = 'cmdVM ' + userid + ' CMD \'' + cmdStr + '\''
          with zvmutils.log_and_reraise_smt_request_failed(action='execute '
          'command on vm via iucv channel'):
              results = self._request(requestData)
  
          ret = results['response']
          return ret