[JENKINS-22326] Calling into foreign code from a toString method, like...

[JENKINS-22326] Calling into foreign code from a toString method, like Queue.Item.getWhy → QueueTaskDispatcher, is unsafe.

core/src/main/java/hudson/model/Queue.java

@@ -1516,7 +1516,7 @@ public class Queue extends ResourceController implements Saveable {
 
         @Override
         public String toString() {
-            return getClass().getName() + ':' + task + ':' + getWhy();
+            return getClass().getName() + ':' + task + ':' + id;
         }
 
         /**