(PUP-11593) Gentoo: Set systemd as default provider

Systemd is available on Gentoo since a long time (although Gentoo
supports multiple init systems). This change marks the provider as
default for Gentoo.

Author: bastelfreak

lib/puppet/provider/service/systemd.rb

@@ -18,6 +18,7 @@
   defaultfor :osfamily => :redhat, :operatingsystem => :fedora
   defaultfor :osfamily => :suse
   defaultfor :osfamily => :coreos
+  defaultfor :osfamily => :gentoo
   defaultfor :operatingsystem => :amazon, :operatingsystemmajrelease => ["2", "2023"]
   defaultfor :operatingsystem => :debian
   notdefaultfor :operatingsystem => :debian, :operatingsystemmajrelease => ["5", "6", "7"] # These are using the "debian" method

spec/unit/provider/service/systemd_spec.rb

@@ -18,7 +18,7 @@
     Puppet::Util::Execution::ProcessOutput.new('', 0)
   end
 
-  osfamilies = [ 'archlinux', 'coreos' ]
+  osfamilies = [ 'archlinux', 'coreos', 'gentoo' ]
 
   osfamilies.each do |osfamily|
     it "should be the default provider on #{osfamily}" do