nickname length enforcement has fencepost errors

Dec 23 19:08:53.410 [warn] connection_tls_finish_handshake(): Other side (80.127.47.237:9001) is 'thetimesareachangi', but we tried to connect to 'thetimesareachangin'

It should either not have a problem here, or it should have prevented this guy from starting his server.

Once we track down which it is, we should audit the rest of the uses of options->nickname to make sure it isn't happening elsewhere.

[Automatically added by flyspray2trac: Operating System: All]