Write out the newest scanner's timestamp instead of the last numerical scanner's timestamp

  n_print = nodes.values()

  n_print.sort(lambda x,y: int(y.pid_error*1000) - int(x.pid_error*1000))

  scan_age = 0

  for scanner in scanner_timestamps.iterkeys():

    scan_age = int(round(scanner_timestamps[scanner],0))

    if scan_age < time.time() - MAX_SCAN_AGE:

      plog("WARN", "Bandwidth scanner "+scanner+" stale. Possible dead bwauthority.py. Timestamp: "+time.ctime(scan_age))

    this_scan_age = int(round(scanner_timestamps[scanner],0))

    scan_age = scan_age if scan_age > this_scan_age else this_scan_age

    if this_scan_age < time.time() - MAX_SCAN_AGE:

      plog("WARN", "Bandwidth scanner "+scanner+" stale. Possible dead bwauthority.py. Timestamp: "+time.ctime(this_scan_age))

  out = file(argv[-1], "w")

  out.write(str(scan_age)+"\n")