Merge remote-tracking branch 'remotes/amit/tags/vser-for-2.7-1' into staging

virtio-console: fix receiving data from guest

# gpg: Signature made Thu 11 Aug 2016 12:17:55 BST
# gpg:                using RSA key 0xEB0B4DFC657EF670
# gpg: Good signature from "Amit Shah <amit@amitshah.net>"
# gpg:                 aka "Amit Shah <amit@kernel.org>"
# gpg:                 aka "Amit Shah <amitshah@gmx.net>"
# Primary key fingerprint: 48CA 3722 5FE7 F4A8 B337  2735 1E9A 3B5F 8540 83B6
#      Subkey fingerprint: CC63 D332 AB8F 4617 4529  6534 EB0B 4DFC 657E F670

* remotes/amit/tags/vser-for-2.7-1:
  virtio-console: set frontend open permanently for console devs

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