docs: def _offline_fcp_device(self, fcp, target_wwpn, target_lun, multipath):
          """ubuntu offline zfcp."""
          device = '0.0.%s' % fcp
          target = '%s:%s:%s' % (device, target_wwpn, target_lun)
          disk_offline = '/sbin/chzdev zfcp-lun %s -d' % target
          host_offline = '/sbin/chzdev zfcp-host %s -d' % fcp
          offline_dev = 'chccwdev -d %s' % fcp
          return '\n'.join((disk_offline,
                            host_offline,
                            offline_dev))