Fix for https://issues.apache.org/jira/browse/AMQ-4516 - Don't decrement topic enqueues when messages are expired
Removed the call to decrement the counters, and added unit test

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@1479925 13f79535-47bb-0310-9956-ffa450edef68