Reboot all usb devices.

        Note:
            If PDU_CONTROLLER_TYPE is not valid, usb devices is not rebooted.

def _init_devices(self):
        """Reboot all usb devices.

        Note:
            If PDU_CONTROLLER_TYPE is not valid, usb devices is not rebooted.
        """
        if not settings.PDU_CONTROLLER_TYPE:
            if settings.AUTO_DUT:
                return

            for device in settings.GOLDEN_DEVICES:
                port, _ = device
                try:
                    with OpenThreadController(port) as otc:
                        logger.info('Resetting %s', port)
                        otc.reset()
                except:
                    logger.exception('Failed to reset device %s', port)
                    self.history.mark_bad_golden_device(device)

            return

        tries = 3
        pdu_factory = PduControllerFactory()

        while True:
            try:
                pdu = pdu_factory.create_pdu_controller(settings.PDU_CONTROLLER_TYPE)
                pdu.open(**settings.PDU_CONTROLLER_OPEN_PARAMS)
            except EOFError:
                logger.warning('Failed to connect to telnet')
                tries = tries - 1
                if tries:
                    time.sleep(10)
                    continue
                else:
                    logger.error('Fatal error: cannot connect to apc')
                    raise
            else:
                pdu.reboot(**settings.PDU_CONTROLLER_REBOOT_PARAMS)
                pdu.close()
                break

        time.sleep(len(settings.GOLDEN_DEVICES))