QAPI patches for 2016-09-19

# gpg: Signature made Mon 19 Sep 2016 17:27:42 BST
# gpg:                using RSA key 0x3870B400EB918653
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>"
# gpg:                 aka "Markus Armbruster <armbru@pond.sub.org>"
# Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867  4E5F 3870 B400 EB91 8653

* remotes/armbru/tags/pull-qapi-2016-09-19:
  Replace qmp-commands.hx by docs/qmp-commands.txt
  qmp-commands.hx: fix some styling
  build-sys: remove qmp-commands-old.h
  monitor: use qmp_dispatch()
  tests: add a test to check invalid args
  qapi: check invalid arguments on no-args commands
  qapi: remove the "middle" mode
  monitor: remove mhandler.cmd_new
  monitor: implement 'qmp_query_commands' without qmp_cmds
  monitor: use qmp_find_command() (using generated qapi code)
  qapi: export the marshallers
  qmp: Hack to keep commands configuration-specific
  qapi: Support unregistering QMP commands
  monitor: register gen:false commands manually
  monitor: simplify invalid_qmp_mode()
  qapi-schema: add 'device_add'
  qapi-schema: use generated marshaller for 'qmp_capabilities'
  build-sys: define QEMU_VERSION_{MAJOR, MINOR, MICRO}
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>