We originally added Vagrant support by tweaking options sent
to the existing RHEV-M and vSphere OVA generation code. This was
a bit of a hack and resulted in confusing filenames.
This adds "vagrant-libvirt" and "vagrant-virtualbox" image types,
passes in the correct options to Image Factory and produces output
files with the conventional ".box" extension and more descriptive
and less confusing vagrant name suffixes.
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