QPID-6175 : [Java Broker] allow maximum message size to be restricted

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1633466 13f79535-47bb-0310-9956-ffa450edef68
QPID-6108 : point to Java 7 SE (and not 6) java docs

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1633469 13f79535-47bb-0310-9956-ffa450edef68