'Make a cluster representation compatible with a target version.'

def obj_make_compatible(self, primitive, target_version):

    super(Cluster, self).obj_make_compatible(primitive, target_version)
    if (target_version == '1.0'):
        for obj_field in ('replication_status', 'frozen', 'active_backend_id'):
            primitive.pop(obj_field, None)
