code fix and test fix for: https://issues.apache.org/jira/browse/AMQ-4225

NetworkBridge MBeans weren't getting registered because of changes in the Broker MBean naming.

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@1429064 13f79535-47bb-0310-9956-ffa450edef68