Update file test_onboarding.py

    device_client : DeviceClient,   # pylint: disable=redefined-outer-name

) -> None:

    validate_empty_scenario(context_client)

    resp = context_client.ListDevices(Empty())

    LOGGER.info('Num Devices enabled:{:d}'.format(resp.devices))

    descriptor_loader = DescriptorLoader(

        descriptors_file=DESCRIPTOR_FILE, context_client=context_client, device_client=device_client)

    results = descriptor_loader.process()

    check_descriptor_load_results(results, descriptor_loader)

    response = context_client.ListDevices(Empty())

    logging.info("DescriptorLoader expects %d devices", descriptor_loader.num_devices)

    logging.info("Devices currently in context: %d", len(response.devices))

    for d in response.devices:

        logging.info("Device ID: %s", d.device_id.device_uuid.uuid)

    descriptor_loader.validate()

    # Verify the scenario has no services/slices