Valgrind shows memory leaks in backup broker after taking these steps:
1. Start primary broker
2. Create a queue
3. Start backup broker with valgrind
4. Wait to see "Joining established cluster" message from backup
5. Shut down backup broker
Valgrind will reprort memory leaks.
For more detail see: https://bugzilla.redhat.com/show_bug.cgi?id=1004411