Implements a 
java.util.logging handler that redirects logged
 messages to a Log4j Appender. This allows all the log messages to be
 collected into a single log file.
 
Configuration:
 The Log4jLoggingHandler is initialized using the following LogManager
 configuration properties:
 
 -  com.bigdata.util.config.Log4jLoggingHandler.loggername
      specifies the name of a Log4j Logger that will be used to find
      the Log4j Appenders used for actually logging the message. This
      property is optional and defaults to the log4j root logger.