Reseting lastStart timestamp on listener ejection and sink notification.

Change-Id: Id13c8517fb4eca84a34ead168055328c236d090b

@@ -84,6 +84,7 @@ public class ListenerRegistry<E extends Event, L extends EventListener<E>>
                       lastListener.getClass().getName(),
                       System.currentTimeMillis() - lastStart);
             removeListener(lastListener);
+            lastStart = 0;
         }
     }
 

@@ -155,6 +155,7 @@ public class CoreEventDispatcher extends DefaultEventSinkRegistry
         public void run() {
             long delta = System.currentTimeMillis() - lastStart;
             if (lastStart > 0 && delta > maxProcessMillis) {
+                lastStart = 0;
                 log.error("Event sink {} exceeded execution time limit: {} ms",
                           lastSink.getClass().getName(), delta);