[Qemu-ppc] [0/8] Assorted pseries updates

[David Gibson]

Now that qemu 1.0 is out there, here are a number of cleanups and
minor bugfixes for the pseries machine to queue up for post 1.0.  Many
of these fix problems with non-default device configurations exposed
by the w.i.p. port of libvirt for powerkvm.