Merge remote-tracking branch 'remotes/armbru/tags/pull-qapi-2018-07-23' into staging

QAPI and monitor patches for 2018-07-23 (3.0.0-rc2)

# gpg: Signature made Mon 23 Jul 2018 14:08:37 BST
# gpg:                using RSA key 3870B400EB918653
# 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-2018-07-23:
  monitor: Fix unsafe sharing of @cur_mon among threads
  qapi: Make 'allow-oob' optional in SchemaInfoCommand

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