Build the VirtualBox image with the qemu builder and convert it
Fix #108 (closed)
Only the vmware build success. The libvirt builds fails due to a artifact which is dropped due to
shell-local (I think), and the virtualbox fails due to a missing OVF file. I think the virtualbox issue is fixable (by adding our own OVF file). I'm not sure abort the libvirt issue, maybe we can "fix" the packer code?