改变LiteflowExecutorInit的spring生命周期，使其更合理

liteflow-spring-boot-starter/src/main/java/com/yomahub/liteflow/springboot/LiteflowExecutorInit.java

@@ -2,24 +2,22 @@ package com.yomahub.liteflow.springboot;
 
 import com.yomahub.liteflow.core.FlowExecutor;
 import com.yomahub.liteflow.flow.FlowBus;
-import org.springframework.beans.factory.InitializingBean;
-import org.springframework.boot.CommandLineRunner;
+import org.springframework.beans.factory.SmartInitializingSingleton;
 
 /**
  * 执行器初始化类 主要用于在启动时执行执行器的初始化方法，避免在运行执行器时第一次初始化而耗费时间
  *
  * @author Bryan.Zhang
  */
-public class LiteflowExecutorInit implements CommandLineRunner {
+public class LiteflowExecutorInit implements SmartInitializingSingleton {
 
 	private final FlowExecutor flowExecutor;
 
 	public LiteflowExecutorInit(FlowExecutor flowExecutor) {
 		this.flowExecutor = flowExecutor;
 	}
-
 	@Override
-	public void run(String... args) throws Exception {
+	public void afterSingletonsInstantiated() {
 		flowExecutor.init(true);
 		FlowBus.needInit();
 	}