In the absence of any 'controls' configuration, BIND uses the rndc.key file
containing a key named rndc-key for rndc by default. In this mode, there is
also no need for any explicit settings in rndc.conf.
Previous iterations and even a release were all broken. The module works again,
sorry for the interlude.
- Giving up on params and moving to module_data (WIP)
- Change the Package and Service references to the static 'bind' name
- Add a meager amount of test coverage
