fix for failing test, the check for inactive durables was waiting exactly as long as the housekeeping thread's sleep interval which could cause it to sometimes miss the very last run of the housekeeper and falsely detect leftover inactive ones.  Make the test wait for longer than the sleep interval and also provide a clean shutdown of the house-keeper thread.

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@1431700 13f79535-47bb-0310-9956-ffa450edef68