Merge remote-tracking branch 'remotes/kraxel/tags/pull-input-20160712-1' into staging

msmouse: fix misc issues, switch to new input interface.
input: add trace events for full queues.
input-linux: better capability checks and event handling.

# gpg: Signature made Tue 12 Jul 2016 09:20:36 BST
# gpg:                using RSA key 0x4CB6D8EED3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>"
# Primary key fingerprint: A032 8CFF B93A 17A7 9901  FE7D 4CB6 D8EE D3E8 7138

* remotes/kraxel/tags/pull-input-20160712-1:
  input-linux: better capability checks, merge input_linux_event_{mouse, keyboard}
  input-linux: factor out input_linux_handle_keyboard
  input-linux: factor out input_linux_handle_mouse
  input: add trace events for full queues
  msmouse: send short messages if possible.
  msmouse: switch to new input interface
  msmouse: fix buffer handling
  msmouse: add MouseState, unregister handler on close

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