As per http://brainsware.org/blog/23-constraints-of-a-design#fn:3 we should be able to change things like how the [default gateway](https://github.com/Brainsware/puppet-kvmhost/blob/master/manifests/config/cobbler.pp#L58-L61) is configured by reading it from Hiera, rather than hard-coding it in the module.
As per http://brainsware.org/blog/23-constraints-of-a-design#fn:3 we should be able to change things like how the default gateway is configured by reading it from Hiera, rather than hard-coding it in the module.