Rename package pkg to internal

pkg/file/file.go

@@ -1,35 +0,0 @@
-/*
-Copyright 2017 The Kubernetes Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package file
-
-import (
-	"crypto/sha1"
-	"encoding/hex"
-	"io/ioutil"
-)
-
-// SHA1 returns the SHA1 of a file.
-func SHA1(filename string) string {
-	hasher := sha1.New()
-	s, err := ioutil.ReadFile(filename)
-	if err != nil {
-		return ""
-	}
-
-	hasher.Write(s)
-	return hex.EncodeToString(hasher.Sum(nil))
-}