Update facter to use require_relative in cases where we know the file to load is in the same repo.
See PUP-11055 for JRuby complications
The PR I created doesn't show any significant improvement on RedHat or Windows in terms of number of file syscalls or the time to run facter. For example, with and without my change, facter takes about 700ms on Windows 2019:
PS C:\Users\Administrator> Measure-Command { facter } | Select-Object TotalMilliseconds
TotalMilliseconds
-----------------
698.9567
I'm going to close this as won't do. We can reopen later if need be.