'Do (soft) delete of backing QOS policy group for a cinder volume.'

def mark_qos_policy_group_for_deletion(self, qos_policy_group_info):

    if (qos_policy_group_info is None):
        return
    spec = qos_policy_group_info.get('spec')
    if (spec is not None):
        current_name = spec['policy_name']
        new_name = (client_base.DELETED_PREFIX + current_name)
        try:
            self.qos_policy_group_rename(current_name, new_name)
        except netapp_api.NaApiError as ex:
            LOG.warning('Rename    failure    in    cleanup    of    cDOT    QOS    policy    group    %(name)s:    %(ex)s', {'name': current_name, 'ex': ex})
    self.remove_unused_qos_policy_groups()
