https://issues.apache.org/jira/browse/AMQ-4276 - remove sub from conduit lis immediatly or weget duplicate remove avents as shown by org.apache.activemq.usecases.TwoBrokerQueueSendReceiveTest

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@1439870 13f79535-47bb-0310-9956-ffa450edef68