Don't hardcode use of 'virtio' for root disk in libvirt driver
Don't hardcode use of 'virtio' for root disk in libvirt driver

The libvirt driver is mistakenly using 'virtio' for the root
disk, instead of the hypervisor specific disk bus.

Change-Id: I742184b08a3ecd428af21ae5beb059bdbf38a9cd
Signed-off-by: Daniel P. Berrange <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

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