lifecycle: upon node shutdown make clear it is a manual stop, so that potential cluster states that come in after the LifyCycle#beforeStop can't start watcher.

Original commit: elastic/x-pack-elasticsearch@e2522a21fc

src/main/java/org/elasticsearch/watcher/WatcherLifeCycleService.java

@@ -40,7 +40,7 @@ public class WatcherLifeCycleService extends AbstractComponent implements Cluste
         clusterService.addLifecycleListener(new LifecycleListener() {
             @Override
             public void beforeStop() {
-                stop(false);
+                stop(true);
             }
         });
         manuallyStopped = !settings.getAsBoolean("watcher.start_immediately",  true);