Update module.py

we are using a HA database to store the config as it is then easy to migrate the arbiter to other hosts if needed without the need to sync config files, so we want as much config as possible to be in MySQL.

We are also considering writing a configuration front-end for the Mysql tables for shinken which should do some basic checking of object relations and make it easy to manage the config. (if we do, we will give it to the community of course)