Add management of systemd-oomd

[jcpunk]

Pull Request (PR) description

Add parameters to manage systemd-oomd and its configuration.

[jcpunk]

I have no idea why those tests are failing...

[jcpunk]

That puppet7/ruby 2.7 test looks like it did something wonky on github?

[smortex]

The failure seems to happen on master too, when gathering ArchLinux facts (removing Arch from metadata.json fix CI on my machine):

https://github.com/voxpupuli/rspec-puppet-facts/blob/0df5a5d82b48f7bc87016e46b247b69a6f5c3302/lib/rspec-puppet-facts.rb#L160

@bastelfreak maybe this will ring a bell?

The keys in facts starting with "os":

 :operatingsystem=>"Archlinux",
 :os=>
  {"architecture"=>"x86_64",
   "family"=>"Archlinux",
   "hardware"=>"x86_64",
   "name"=>"Archlinux",
   "release"=>{"full"=>nil, "major"=>nil},
   "selinux"=>{"enabled"=>false}},
 :osfamily=>"Archlinux",

[jcpunk]

Any chance for a merge?