https://issues.apache.org/jira/browse/AMQ-4662 - kahadb default checksumJournalFiles = true - validate no migration impact as we currently store default checksum value of 0

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@1509178 13f79535-47bb-0310-9956-ffa450edef68