QPID-5035: Respect data-dir setting from config file

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1510657 13f79535-47bb-0310-9956-ffa450edef68
QPID-4327: HA Handle brokers joining and leaving during a transaction.

During a transaction:
- A broker leaving aborts the transaction.
- A broker joining does not participate in the transaction
  - but does receive the results of the TX via normal replication.

Clean up tx-queues when the transaction completes.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1510678 13f79535-47bb-0310-9956-ffa450edef68