(PUP-10162) Add support for Cumulus v4.0.0

Cumulus v4 is much the same as v3, it's based on Debian and also uses SystemD.  The only change necessary for it to work is ensuring the service provider uses SystemD

Author: devicenull

lib/puppet/provider/service/systemd.rb

@@ -25,7 +25,7 @@
   notdefaultfor :operatingsystem => :LinuxMint, :operatingsystemmajrelease => ["10", "11", "12", "13", "14", "15", "16", "17"] # These are using upstart
   defaultfor :operatingsystem => :ubuntu
   notdefaultfor :operatingsystem => :ubuntu, :operatingsystemmajrelease => ["10.04", "12.04", "14.04", "14.10"] # These are using upstart
-  defaultfor :operatingsystem => :cumuluslinux, :operatingsystemmajrelease => ["3"]
+  defaultfor :operatingsystem => :cumuluslinux, :operatingsystemmajrelease => ["3", "4"]
 
   def self.instances
     i = []