Revision 518437

- Propagate the AlwaysSyncSend setting from the ConnectionFactory to the Connection
- Got rid of the UseSyncSend property since AlwaysSyncSend was already there and did the same thing.
- Updated VMPendingMessageCursor so that it updates the reference counters of the message so that the usage managers are properly updated since the messages are being kept in memory.
- Updated the region Queue so that it decrements the usage in the case of a transaction.
- Enabled the ProducerFlowControlTest since it is now working.