docs: def get_mirror_resources_by_name_map(self, scope=None):
          """ returns a map volume_name -> volume, cg_name->cg
              scope is either None or CG or Volume
          """
          volumes_mirrors_by_name = dict()
          cgs_mirrors_by_name = dict()
          if ((scope is None) or (scope.lower() == 'volume')):
              mirror_list = self.xcli_client.cmd.mirror_list(scope='Volume')
              for xcli_mirror in mirror_list:
                  name = MirroredEntities.get_mirrored_object_name(xcli_mirror)
                  volumes_mirrors_by_name[name] = xcli_mirror
          if ((scope is None) or (scope.lower() == CG)):
              for xcli_mirror in self.xcli_client.cmd.mirror_list(scope='CG'):
                  name = MirroredEntities.get_mirrored_object_name(xcli_mirror)
                  cgs_mirrors_by_name[name] = xcli_mirror
          res = Bunch(volumes=volumes_mirrors_by_name, cgs=cgs_mirrors_by_name)
          return res