QPID-6289: [Java Broker] Fix for failing BDB system test caused by rev 1648039

* Introduced single root interface BDBHAReplicaVirtualHost to meet the requirements of the model

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1648303 13f79535-47bb-0310-9956-ffa450edef68