virtio,pc features, fixes

New features:
    vhost-user multiqueue support
    virtio-ccw virtio 1 support

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

# gpg: Signature made Fri 25 Sep 2015 07:40:35 BST using RSA key ID D28D5469
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>"
# gpg:                 aka "Michael S. Tsirkin <mst@redhat.com>"

* remotes/mst/tags/for_upstream:
  MAINTAINERS: add more devices to the PCI section
  MAINTAINERS: add more devices to the PC section
  vhost-user: add a new message to disable/enable a specific virt queue.
  vhost-user: add multiple queue support
  vhost: introduce vhost_backend_get_vq_index method
  vhost-user: add VHOST_USER_GET_QUEUE_NUM message
  vhost: rename VHOST_RESET_OWNER to VHOST_RESET_DEVICE
  vhost-user: add protocol feature negotiation
  vhost-user: use VHOST_USER_XXX macro for switch statement
  virtio-ccw: enable virtio-1
  virtio-ccw: feature bits > 31 handling
  virtio-ccw: support ring size changes
  virtio: ring sizes vs. reset
  pc: Introduce pc-*-2.5 machine classes
  q35: Move options common to all classes to pc_i440fx_machine_options()
  q35: Move options common to all classes to pc_q35_machine_options()
  virtio-net: unbreak self announcement and guest offloads after migration
  virtio: right size for virtio_queue_get_avail_size

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