support fedora builds

[alfredodeza]

This means that we need to configure a node so that we can fire it up via the provider.

Issues to solve:

• needs to install python (like on xenial)

• "set authorized_keys" fails because:

  msg: Aborting, target uses selinux but python bindings (libselinux-python) aren't installed!
  

• yum is not supported so it needs to install deps with dnf:

  ImportError: No module named yum
  

[alfredodeza]

Or just use rpm mock (pbuilder-like tool for rpms) and be done with this