Logging messes up between serve and gearbox

[amol-]

As Cliff provided its own logging configuration and serve command did too the two pretty much messed one with the other.

Now that cliff has been removed it would pretty much make sense to merge the two logging configuration, let gearbox load logging configuration from a file and have serve use gearbox configuration.

[amol-]

This somehow improved in https://github.com/TurboGears/gearbox/commit/e89c2f00e322178f091d5f202e024b880d4ee247 which doesn't disable gearbox logging configuration anymore when serve is used. Still there are two different logging configs, one from gearbox and one from serve.