Merge remote-tracking branch 'remotes/armbru/tags/pull-qapi-2021-10-27' into staging

QAPI patches patches for 2021-10-27

# gpg: Signature made Wed 27 Oct 2021 08:21:54 AM PDT
# 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]

* remotes/armbru/tags/pull-qapi-2021-10-27:
  qapi: Implement deprecated-input={reject,crash} for enum values
  qapi: Move compat policy from QObject to generic visitor
  qapi: Add feature flags to enum members
  qapi: Enable enum member introspection to show more than name
  qapi: Improve input_type_enum()'s error message

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>