tests/qapi-schema: Document events with base don't work When event FOO's 'data' is a struct with a base, we consider only the struct's direct members, and ignore its base. The generated qapi_event_send_foo() doesn't take arguments for base members. No such events currently exist in the QMP schema. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>