Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

virtio,vhost: fixes

Add a feature flag for new protocol messages.
Misc fixes.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
# gpg: Signature made Mon 09 Apr 2018 15:37:29 BST
# gpg:                using RSA key 281F0DB8D28D5469
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>"
# gpg:                 aka "Michael S. Tsirkin <mst@redhat.com>"
# Primary key fingerprint: 0270 606B 6F3C DF3D 0B17  0970 C350 3912 AFBE 8E67
#      Subkey fingerprint: 5D09 FD08 71C8 F85B 94CA  8A0D 281F 0DB8 D28D 5469

* remotes/mst/tags/for_upstream:
  virtio-serial: fix heap-over-flow
  vhost: Allow adjoining regions
  contrib/libvhost-user: add the protocol feature used for SET/GET message
  vhost-user: back SET/GET_CONFIG requests with a protocol feature
  vhost-user-blk: set config ops before vhost-user init

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