remove the logginglistener module

[trevj]

We added this back when logging was unduly expensive because we were emitting one log statement (or more) for every packet received and sent by the SOCKS proxy. That hasn't been true for some time and we've not been diligent in always including this module; for instance it's not currently included by any of the cloud modules (https://github.com/uProxy/uproxy/commit/bb8058b).

Since it's no longer really necessary, is a pain to keep including, and leads to spurious log entries I propose removing it.