During shutdown op_disconnect may be sent to invalid handle #7296
Description
Reported privately by artyom.abakumov artyom.abakumov@red-soft.ru
In Dispatcher::shutdown() providers are first disabled and then service and attachment interfaces are searched for and disabled. For remote provider connections are closed via force_close(), which is why release() of attachments and/or services cause sending op_disconnect using incorrect port_handle value.