docs: public synchronized void stop() {
          // stopps all watchdogs
          Iterator iter = registeredWachdogs.values().iterator();
          while (iter.hasNext()) {
              Watchdog wd = (Watchdog) iter.next();
              wd.stop();
              if (log.isInfoEnabled()) {
                  log.info("WatchdogRegistry.stop() : Watchdog " + wd.getId() + " is stopped");
              }
          }
  
  
      }