def default_io_logger(logger_io, progname)
      logger = Logger.new(logger_io)
      logger.progname = progname
      logger.datetime_format = '%Y-%m-%d %H:%M:%D %Z'
      logger
    end
def default_io_logger(logger_io, progname)
      logger = Logger.new(logger_io)
      logger.progname = progname
      logger.datetime_format = '%Y-%m-%d %H:%M:%D %Z'
      logger
    end
Setup default IO logger
 @return [Logger] logger