抽取公共方法，重构代码逻辑

IP-learning-graph/src/main/java/cn/ac/iie/utils/ExecutorThreadPool.java

@@ -32,7 +32,7 @@ public class ExecutorThreadPool {
         pool.execute(command);
     }
 
-    public static void awaitThreadTask(){
+    public void awaitThreadTask(){
         try {
             while (!pool.awaitTermination(ApplicationConfig.THREAD_AWAIT_TERMINATION_TIME, TimeUnit.SECONDS)) {
                 LOG.warn("线程池没有关闭");
@@ -42,7 +42,7 @@ public class ExecutorThreadPool {
         }
     }
 
-    public static void shutdown(){
+    public void shutdown(){
         pool.shutdown();
     }