Switch isobuilders to vagrant-libvirt in Puppet

This ticket is meant to track the puppet part of the implementation of vagrant-libvirt on our Jenkins isobuilders. The tails.git part has been achieved in #11972 (closed). #11972-note_5 and following notes contain some initial review from intrigeri, that needs to be addressed. The complete switch in puppet also needs to be finished in a dedicated branch of puppet-tails.

Feature Branch: puppet-tails:feature/11972-use-vagrant-in-jenkins

Original created by @bertagaz on 12505 (Redmine)