QPID-6047 : [Java Broker] Improve Message conversion between 1.0 and 0.x protocols - add mapping from application property qpid.subject to the 1.0 subject property

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1620858 13f79535-47bb-0310-9956-ffa450edef68