Context matching caused the 'has_pvpanic = true' to be applied to
the 1.6 machine type instead of the 1.5 machine type.
Reported-by: NMarkus Armbruster <armbru@redhat.com>
Reported-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>