Add Libvirt support
Add Libvirt support

Update machines.yml to include a Libvirt-formatted box

Signed-off-by: Scott Lowe <4438a3189c2e58cebd81dd6bb6e49e12f5ad0fd6@scottlowe.org>

lowescott/learning-tools,lowescott/learning-tools,lowescott/learning-tools,lowescott/learning-tools