fixup-PR#506 Speed improvements in facter resolution

This is to improve speed on Facter resolution of service_provider fact
that was just introduced in PR# 506.  The improvements go from 280ms
resolution time approx. down to 2ms resolution time approx. by adding
requires statements.

lib/facter/service_provider.rb

@@ -7,6 +7,9 @@
 #
 # Caveats:
 #
+require 'puppet/type'
+require 'puppet/type/service'
+
 Facter.add(:service_provider) do
   setcode do
     Puppet::Type.type(:service).newservice(:name => 'dummy')[:provider].to_s