This comment is a carry-over from the previous comments in pull request GH-1418.  Unfortunately it is a blocker to merging this in.

As a matter of organization, this file should definitely not live in Puppet's library directory.  `lib/` is intended for Puppet library code, not configuration files.  I recommend updating this to place the file in the configuration directory since libuser defaults to `/etc/libuser.conf`, if we use a custom configuration it should probably live somewhere in `/etc`, perhaps `/etc/puppet`?