amule does not handle server connection aborts. #905

I still get occurences of #393 (No results after some time).

I made a simple test with amule + JEmule server and detected indeed a problem.

Test case:

1. start server
2. start amule
3. let connect it to the server
4. search -> works
5. quit the server -> I see a FIN, ACK packet
6. redo search -> hangs; I see the search request and a RST packet from the server.

-> even the server keepalive in the extended tab does not manage to get amule out of this trap.

It sounds like amule is stuck waiting for a reply from the server and can not handly the connection abort (both FIN and RST).

And this is not even a real "timeout situation", as the server responds clearly "I'm not here (anymore)" on TCP level ...