Merge remote-tracking branch 'remotes/dgibson/tags/ppc-for-2.11-20171122' into staging

ppc patch queue 2017-11-22

Several more fixes to merge for qemu-2.11.

# gpg: Signature made Wed 22 Nov 2017 04:29:57 GMT
# gpg:                using RSA key 0x6C38CACA20D9B392
# gpg: Good signature from "David Gibson <david@gibson.dropbear.id.au>"
# gpg:                 aka "David Gibson (Red Hat) <dgibson@redhat.com>"
# gpg:                 aka "David Gibson (ozlabs.org) <dgibson@ozlabs.org>"
# gpg:                 aka "David Gibson (kernel.org) <dwg@kernel.org>"
# Primary key fingerprint: 75F4 6586 AE61 A66C C44E  87DC 6C38 CACA 20D9 B392

* remotes/dgibson/tags/ppc-for-2.11-20171122:
  ppc: fix VTB migration
  spapr: Implement bug in spapr-vty device to be compatible with PowerVM
  hw/ppc/spapr: Fix virtio-scsi bootindex handling for LUNs >= 256

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>