This commit fixes a regression introduced as part of the updated
AAA/ACL code. Since that code has not shipped in a stable release,
this is not being entered into the changelog.
The issue was that when processing the deferred payloads, we were
trying to parse the `auth_info` key from the metadata as though
it were a json-serialized-string, but it was in fact already parsed
and was actually a json object.
This resulted in a runtime error that caused the message to be
logged as a Bounce like:
```
expected 'auth_info' to be a string value, got Ok(Object (..))
```
This commit adds an explicit integration test for deferred generation so
that we can catch this sort of thing more easily moving forwards, as
well as resolves this issue.
Wez Furlong
dd9df65fe6