Matches the behaviour of real sockets in a real Online server better.
Seems to get rid of the occasional hang problem.
I had already some time ago suspected that such a change would fix
that problem, but unfortunately my first attempt missed one crucial
detail, so it didn't, and I spent days looking for other ways to fix
the problem instead, in vain.
Probably I should add some sanity limit on the number of buffered
messages, though... But if such a sanity limit then would be hit, most
likely much else is totally broken already anyway.
Change-Id: Ice43057814ee5abd85b2935ffaa91765845a515a
decf78ff2e