Merge remote-tracking branch 'remotes/armbru/tags/pull-monitor-2016-03-16' into staging

Monitor patches for 2016-03-16

# gpg: Signature made Wed 16 Mar 2016 09:47:23 GMT using RSA key ID EB918653
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>"
# gpg:                 aka "Markus Armbruster <armbru@pond.sub.org>"

* remotes/armbru/tags/pull-monitor-2016-03-16:
  qdev-monitor: add missing aliases for virtio device classes
  qdev-monitor: sort alias table by typename
  qdev-monitor: improve error message when alias device is unavailable

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