intermittent hang of test for https://issues.apache.org/jira/browse/AMQ-2021 showed concurrency flaw in https://issues.apache.org/jira/browse/AMQ-3236 - properties are only applied to the message copy that is deferred till needed

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@1508819 13f79535-47bb-0310-9956-ffa450edef68