Notice that we can't still run tests with it disabled.  Both cdrom-test and
drive_del-test use virtio-scsi without checking if it is enabled.
Reviewed-by: NThomas Huth <thuth@redhat.com>
Reviewed-by: NLaurent Vivier <lvivier@redhat.com>
Signed-off-by: NJuan Quintela <quintela@redhat.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>