This commit introduces a new vagrant stage and initially only supports
the libvirt backend. The vagrant stage takes a disk image as input
generates a Vagrantfile and metadata.json.
Pacman is the default package manager for Arch Linux and derivates, the
pacman.conf stage generate a valid pacman.conf configuration file.
Co-Authored-By: Jelle van der Waa <jvanderwaa@redhat.com>
