Remove outdated probing behaviour in AO2

[Salanto]

See title.
This means any client initiating the handshake over HI would directly want to join the server.
A breaking change for sure, but a welcome departure from old and horrible network design.

Somewhat recent playercounts can always be retrieved from ms3.

This might be a good addition for devel clients given they are essentially an on-going beta on the road to the next major version.

[oldmud0]

Seems like it would be a relatively straightforward change to have the client stop connecting to the server on click. You'd just lose the max player count, though I don't think that will be particularly missed.