These corrections are always safe:

bundle exec rubocop -a

These ones are sometimes not safe

bundle exec rubocop -A

The list of supported Operating Systems is outdated.  Update it and add
some basic acceptance tests to ensure the code is valid.

While AIO Puppet has a well-known path to augeas lenses, non-AIO Puppet
use a sysstem path that is OS-dependant.

Rework the way this path is retrieved so that we can extand this easily
using Hiera.