'Return the OVS trunk parent port plugged on trunk_bridge.'

def _get_parent_port(self, trunk_bridge):

    trunk_br_ports = trunk_bridge.get_ports_attributes('Interface', columns=['name', 'external_ids'], if_exists=True)
    for trunk_br_port in trunk_br_ports:
        if (not is_trunk_service_port(trunk_br_port['name'])):
            return trunk_br_port
    raise exceptions.ParentPortNotFound(bridge=trunk_bridge.br_name)
