QPID-5962: [Java Broker] Prevent two or more BDB virtual host or virtual hosts nodes sharing the same JE environment path

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1615928 13f79535-47bb-0310-9956-ffa450edef68
QPID-5048: add pom to build the AMQP 1.0 JMS client examples, simplify example and make it exit promptly

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1615929 13f79535-47bb-0310-9956-ffa450edef68