add rollback interface

routers/api/v1/node.go

@@ -578,6 +578,7 @@ func Rollback(c *gin.Context) {
 	if (pai.LocalLastHeight - 1000) <= 0 {
 		rollheight = 1
 	}
+	time.Sleep(time.Second * 2)
 	tlog.Info("rollback start","height",pai.LocalLastHeight,"rollbackheight",rollheight)
 	var buf bytes.Buffer
 	cmd := exec.Command("v7-bityuan", "-rollback",fmt.Sprintf("%d",rollheight))