Fix dialtesting multi task (#173)

* fix(dialtesting): fix multi task retry

* save

---------

Co-authored-by: zhengb <zhengb@guance.com>

Author: zhengboah

dialtesting/multi.go

@@ -164,12 +164,13 @@ func (t *MultiTask) runHTTPStep(step *MultiStep) (map[string]interface{}, error)
 	for runCount < maxCount {
 		httpTask := &HTTPTask{}
 		task, err = NewTask(step.TaskString, httpTask)
-		if t.beforeRun != nil {
-			task.SetBeforeRun(t.beforeRun)
-		}
 		if err != nil {
 			return nil, fmt.Errorf("new task failed: %w", err)
 		}
+
+		if t.beforeRun != nil {
+			task.SetBeforeRun(t.beforeRun)
+		}
 		task.SetOption(t.GetOption())
 		for _, v := range t.extractedVars {
 			task.AddExtractedVar(&ConfigVar{
@@ -221,6 +222,10 @@ func (t *MultiTask) runHTTPStep(step *MultiStep) (map[string]interface{}, error)
 		}
 		task.Stop()
 
+		if err == nil && result["status"] == "OK" {
+			break
+		}
+
 		runCount++
 		if runCount < maxCount {
 			time.Sleep(interval)