Restarted dispatch loop become stopped when event sink exceeded execution time limit in CoreEventDispatcher

Dispatch loop is not re-spawned when event sink exceeded execution time limit in CoreEventDispatcher.
(core/net/src/main/java/org/onosproject/event/impl/CoreEventDispatcher.java)

1. Event sink exeeded execution time limit in Dispatch loop of CoreEventDispatcher
2. Watchdog detects that, and stop the dispatch loop, and re-spawn the disptach loop
3. After some time, the re-spawned dispatch loop stopped again.

• KILL_PILL event is added to eventsQueue

          void stop() {
              stopped = true;
              stopWatchdog();
              add(KILL_PILL);
          }
  

• The restarted loop become stopped again because it receives KILL_PILL event

          public void run() {
              stopped = false;
              log.info("Dispatch loop initiated");
              while (!stopped) { 
                  try {
                      // Fetch the next event and if it is the kill-pill, bail
                      Event event = eventsQueue.take();
                      if (event == KILL_PILL) {
                          break;                            // if the restarted loop receives PILL_KILL, it will stop
                      }
                      process(event);
                  } catch (InterruptedException e) {
                      log.warn("Dispatch loop interrupted");
                  } catch (Exception | Error e) {
                      log.warn("Error encountered while dispatching event:", e);
                  }
              }
              log.info("Dispatch loop terminated");
          }
  

4. Dispatch loop watchdog also does not work again