QPID-5718: Dead code in the HA codebase

Removed: std::ostream& operator<<(std::ostream& o, const QueueSetPrinter& qp)
Already gone: void collectQueueReplicators(const boost::shared_ptr<Exchange>& ex, set<boost::shared_ptr<QueueReplicator> >& collect)

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1589431 13f79535-47bb-0310-9956-ffa450edef68
NO-JIRA: Removed dead code