Split it out from the s390-ccw-virtio machine, add Thomas as a
maintainer in addition to Christian.
Acked-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Acked-by: NThomas Huth <thuth@redhat.com>
Signed-off-by: NCornelia Huck <cohuck@redhat.com>