Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20171120-v1' into staging

Fix storing cpu status (both kvm and tcg), locking around diag 308
(tcg only) and a non-zero variable in the s390-ccw bios.

# gpg: Signature made Mon 20 Nov 2017 15:18:05 GMT
# gpg:                using RSA key 0xDECF6B93C6F02FAF
# gpg: Good signature from "Cornelia Huck <conny@cornelia-huck.de>"
# gpg:                 aka "Cornelia Huck <huckc@linux.vnet.ibm.com>"
# gpg:                 aka "Cornelia Huck <cornelia.huck@de.ibm.com>"
# gpg:                 aka "Cornelia Huck <cohuck@kernel.org>"
# gpg:                 aka "Cornelia Huck <cohuck@redhat.com>"
# Primary key fingerprint: C3D0 D66D C362 4FF6 A8C0  18CE DECF 6B93 C6F0 2FAF

* remotes/cohuck/tags/s390x-20171120-v1:
  pc-bios/s390-ccw.img: update image
  pc-bios/s390-ccw: Fix problem with invalid virtio-scsi LUN when rebooting
  s390x/tcg: fix DIAG 308 with > 1 VCPU (MTTCG)
  s390x: fix storing CPU status (again)

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