docs: def _set_zfcp_config_files(self, fcp, target_wwpn, target_lun):
          """rhel6 set WWPN and LUN in configuration files"""
          device = '0.0.%s' % fcp
          set_zfcp_conf = 'echo "%(device)s %(wwpn)s %(lun)s" >> /etc/zfcp.conf'\
                          % {'device': device, 'wwpn': target_wwpn,
                             'lun': target_lun}
          trigger_uevent = 'echo "add" >> /sys/bus/ccw/devices/%s/uevent\n'\
                           % device
          return '\n'.join((set_zfcp_conf,
                            trigger_uevent))