Allow OracleLinux as OS as same as CentOS/RedHat

[lsotoca]

Just only from my lack of knowledge, if there is any reason to reject Oracle Linux as OS
This happens at manifests/params.pp

I think it could be added here:

    'CentOS','RedHat','OracleLinux': {
      $python_version = $facts['os']['release']['major'] ? {
        '7' => '3.6',
        '8' => '3.8',
      }

Most of the times, without taking into account external repos that could be added also to CentOS or RHEL, own Oracle Linux repos have usually the same versions of every single package as CentOS and RHEL, and futhermore they usually have more recent ones. It happens with Docker, PHP, Python, etc...

[sri4kanne]

Is there anyone working on this or could be prioritized? would definitely benefit us as we are on very old version when OL/COS were supported.
I'm fairly new to puppet and would love to learn and contribute if a PR would be accepted.