[Broker-J] ACL - Posting unknown attributes leaves broker in bad internal state

When POSTing an ACL rule with unknown attributes to the Qpid HTTP management API, the server responds with HTTP 422, Unprocessable Entity. This is somewhat OK, however, I think maybe a 400 Bad Request would be more appropriate.

But after the post, the broker is somehow left in a bad internal state, as the returned Json is incomplete and unparseable.

Example POST in aclRequest.json

Qpid log from the incident qpidErrorLog.txt

Returned Json from subsequent GET resultingAcl.json