In verify_empty_devices(), we can check the non presence of specified tags ['nic-tag', 'volume-tag'] instead of no device so that if any other devices is there we do not keep trying in wait loop.
In verify_ empty_devices( ), we can check the non presence of specified tags ['nic-tag', 'volume-tag'] instead of no device so that if any other devices is there we do not keep trying in wait loop.