docs: def get_host_power_status(self):
          """Request the power state of the server.
  
          :returns: Power State of the server, 'ON' or 'OFF'
          :raises: IloError, on an error from iLO.
          """
          sushy_system = self._get_sushy_system(PROLIANT_SYSTEM_ID)
          return GET_POWER_STATE_MAP.get(sushy_system.power_state)