https://issues.apache.org/jira/browse/AMQ-2719 - resolve possible skipped dispatch - https://issues.apache.org/jira/browse/AMQ-2106 - remove overload so that distribution order is not compromised when consumers are removed with a valid last delivered sequence. Additional test that uses consumer recreation to redistribute groups
tidy up test code layout
https://issues.apache.org/jira/browse/AMQ-5476 - fix and test - https://issues.apache.org/jira/browse/AMQ-2790 - default messagePrioritySupported=false