'Delete replication pair and remote lun.
Purpose:
1. delete replication pair
2. delete remote_lun'

def delete_replica(self, volume):

    LOG.debug('Delete    replication,    volume:    %s.', volume.id)
    info = get_replication_driver_data(volume)
    pair_id = info.get('pair_id')
    if pair_id:
        self._delete_pair(pair_id)
    rmt_lun_id = info.get('rmt_lun_id')
    if rmt_lun_id:
        self._delete_rmt_lun(rmt_lun_id)
