provider/designate.go
func (c designateClient) DeleteRecordSet(zoneID, recordSetID string) error {
	return recordsets.Delete(c.serviceClient, zoneID, recordSetID).ExtractErr()
}
func (c designateClient) DeleteRecordSet(zoneID, recordSetID string) error {
	return recordsets.Delete(c.serviceClient, zoneID, recordSetID).ExtractErr()
}
// DeleteRecordSet deletes recordset in the given DNS zone