(#9080) Make facts.d match Facter 2.0

Based on feedback from Luke, the facts.d directory should at least match
the directory that will be used by Facter 2.0.

Reading #2157 I believe the Facter 2.0 facts.d feature is reasonably API
compatible with this custom fact from R.I. so I'm comfortable using the
same filesystem path.

Change in behavior:  Now look for facts in:
 * /etc/facter/facts.d
 * /etc/puppetlabs/facter/facts.d

Author: Jeff McCune

lib/facter/facter_dot_d.rb

@@ -179,5 +179,5 @@ def create
     end
 end
 
-Facter::Util::DotD.new("/etc/facts.d").create
-Facter::Util::DotD.new("/etc/puppetlabs/facts.d").create
+Facter::Util::DotD.new("/etc/facter/facts.d").create
+Facter::Util::DotD.new("/etc/puppetlabs/facter/facts.d").create