code: private String buildLogPath(File bootstrapLogDir, String logFileName) {
      return new File(bootstrapLogDir, logFileName).getAbsolutePath();
    }
docs: Constructs a path of a file under the bootstrap log directory.
  @param bootstrapLogDir  The File defining the log directory.
  @param logFileName  The name of the log file.
  @return  The full path to the log file.