Merge remote-tracking branch 'remotes/armbru/tags/pull-qapi-2017-05-31' into staging

Merge remote-tracking branch 'remotes/armbru/tags/pull-qapi-2017-05-31' into staging

QAPI patches for 2017-05-31

# gpg: Signature made Wed 31 May 2017 18:06:39 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-2017-05-31:
  qapi: Reject alternates that can't work with keyval_parse()
  tests/qapi-schema: Avoid 'str' in alternate test cases
  qapi: Document visit_type_any() issues with keyval input
  qobject-input-visitor: Reject non-finite numbers with keyval

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