Oracle Linux support

[avcbruh]

Can we add:

{
  "operatingsystem": "OracleLinux",
  "operatingsystemrelease": [
    "7",
    "8"
  ]
},

Into metadata.json

I've been doing this myself as it works fine for my needs. Which I can continue to do if there are other functions that perhaps I'm not utilizing that do not work in Oracle Linux. It is rebranded RedHat so I'm not sure what the issue is, but not having this is a show stopper for any Puppet module that requires augeasproviders_core.

Oracle Linux admins are out here. :)

[ekohl]

A PR is very welcome.