smartserver main log does nothing

[Thomi Richards]

The bzr smartserver logging code is rather broken: currently everything is logged to the 'access log', and the main log is given a null event handler.

This requires a reasonably good look at how the logging works in the twisted app - it's more complicated than straight python logging since it needs to recieve log messages from the twisted framework. I think a rework is in order. Ideally we'd have:

 * A main log that is the default target for all log messages.
 * an access log that recieve connection & disconnection messages (what we have now).
 * a mechanism to reload the current log file on SIGHUP (this may be automatic already?) - this is required for logrotate to do it's thing.