The key referred to in `modules/rhizo_base/manifests/openbsc.pp`. A
default value of 0 (anything but "1") will result in a new config
being generated from a template.
rhizo::grps is referred to in
`modules/rhizo_base/manifests/init.pp`. The default value of "none" is
only a guess but allows puppet provisioning to complete and the
osmocom stack to start.