https://issues.apache.org/jira/browse/AMQ-4157 - test case and fix. when an ack is in a tx we need to wait for the store sync as it may be a rollback

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@1431463 13f79535-47bb-0310-9956-ffa450edef68