Merge remote-tracking branch 'remotes/armbru/tags/pull-qapi-2019-10-29' into staging

Merge remote-tracking branch 'remotes/armbru/tags/pull-qapi-2019-10-29' into staging

QAPI patches for 2019-10-29

# gpg: Signature made Tue 29 Oct 2019 06:40:56 GMT
# gpg:                using RSA key 354BC8B3D7EB2A6B68674E5F3870B400EB918653
# gpg:                issuer "armbru@redhat.com"
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>" [full]
# gpg:                 aka "Markus Armbruster <armbru@pond.sub.org>" [full]
# Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867  4E5F 3870 B400 EB91 8653

* remotes/armbru/tags/pull-qapi-2019-10-29:
  qapi: Check feature documentation against the schema
  qapi: Polish reporting of bogus member documentation
  qapi: Lift features into QAPISchemaEntity
  qapi: Fold normalize_enum() into check_enum()
  qapi: Fold normalize_features() into check_features()
  qapi: Fold normalize_if() into check_if()
  qapi: Eliminate .check_doc() overrides
  qapi: Simplify ._make_implicit_object_type()
  qapi: Fix doc comment checking for commands and events
  qapi: Clean up doc comment checking for implicit union base
  qapi: Fix enum doc comment checking
  qapi: Split .connect_doc(), .check_doc() off .check()
  qapi: De-duplicate entity documentation generation code
  qapi: Implement boxed event argument documentation
  qemu-doc: Belatedly document QMP command deprecation
  tests/qapi-schema: Fix feature documentation testing
  tests/qapi-schema: Cover alternate documentation comments
  tests/qapi-schema: Demonstrate command and event doc comment bugs
  tests/qapi-schema: Demonstrate feature and enum doc comment bugs

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