When override workQueue for the controller should shutdown the origin…

…al queue incase thread leakage

extended/src/main/java/io/kubernetes/client/extended/controller/builder/DefaultControllerBuilder.java

@@ -104,6 +104,9 @@ public DefaultControllerBuilder withName(String controllerName) {
    * @return the controller builder
    */
   public DefaultControllerBuilder withWorkQueue(RateLimitingQueue<Request> workQueue) {
+    if (this.workQueue != null && !this.workQueue.isShuttingDown()){
+      this.workQueue.shutDown();  
+    }
     this.workQueue = workQueue;
     return this;
   }