fix: set vault_os_packages for RedHat

[dotdiego]

#302

Is it possible to handle package installation conditionally like this ? This method comes from ansible-community.ansible-nomad role.

I think that RedHat8.yml can be removed too with this solution.

[gardar]

Yes this can be done, but instead of having to define the name and version of every rhel based distro you can simply check if the system is running python 2 or 3. Something like this:

  - "{{ 'libselinux-python' if ansible_python_version is version('3', '<')  else 'python3-libselinux' }}"

And yes while you are at it, it would be good to delete the vars/RedHat8.yml file as it is no longer needed with this change.

[dotdiego]

@gardar thanks for your input. I've edited the file with your solution and removed RedHat8.yml