code: def replace_lun(self, *lun_list):
          
          lun_add = self._prepare_luns_add(lun_list)
          lun_remove = self._prepare_luns_remove(lun_list, False)
          return self.modify(lun_add=lun_add, lun_remove=lun_remove)
docs: Replaces the exiting LUNs to lun_list.