Added a simplified execute() call to MysqlConnection that only requires an outbound protocol message object and result processor.
Shifted MyReplSlaveClientConnection response processing to use DefaultResultProcessor, in preperation for using MysqlConnection
Converted MyReplSlaveClientConnection to use MysqlConnection under the covers.
Change MyReplEventTest over to use HexLogFile, and stop using MyDecoder and MyEncoder.
Make MyDecoder, MyEncoder, and sub-classes into inner classes of MyTestReplicationMaster, the only current usage.