clean up some unnecessary dependencies, logics, and linter warnings (#963)

Signed-off-by: Tiger Wang <tigerwang@outlook.com>

pkg/utils/file/file_test.go

@@ -3,9 +3,13 @@ package file
 import (
 	"fmt"
 	"testing"
+
+	"go.uber.org/goleak"
 )
 
 func TestNameAccumulation(t *testing.T) {
+	goleak.VerifyNone(t)
+
 	fmt.Println("aaa")
 	a := NameAccumulation("/mnt/test_1_1", "/")
 	fmt.Println(a)