code: def schedule_and_propagate_host_downtime(self, host, start_time, end_time,
                                               fixed, trigger_id, duration, author, comment):
          
          logger.warning("The external command 'SCHEDULE_AND_PROPAGATE_HOST_DOWNTIME' "
                         "is not currently implemented in Alignak. If you really need it, "
                         "request for its implementation in the project repository: "
                         "https://github.com/Alignak-monitoring/alignak")
          self.send_an_element(make_monitoring_log(
              'warning', 'SCHEDULE_AND_PROPAGATE_HOST_DOWNTIME: this command is not implemented!'))
docs: DOES NOTHING (Should create host downtime and start it?)
          Format of the line that triggers function call::
  
          SCHEDULE_AND_PROPAGATE_HOST_DOWNTIME;<host_name>;<start_time>;<end_time>;
          <fixed>;<trigger_id>;<duration>;<author>;<comment>
  
          :return: None