- support new notices (sent as Mysqlx.Notice.Frame) in case the connection is closed:
a) the connection is idle / timeout has been exceeded (ER_IO_READ_ERROR code: 1810)
b) server shuts down (ER_SERVER_SHUTDOWN code: 1053)
c) server was killed (ER_SESSION_WAS_KILLED code: 3169)
- proper message is generated when notice has been received, or there is try to use such a closed connection
- related changes also in connection pooling