Delete some dead code and fix nits.

pkg/image/append.go

@@ -1,33 +0,0 @@
-/*
-Copyright 2019 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 image
-
-// Append appends a slice of type Tag to slice of type Image
-func Append(images []Image, tags ...ImageTag) []Image {
-	for _, tag := range tags {
-		images = append(images, toImage(tag))
-	}
-	return images
-}
-
-func toImage(tag ImageTag) Image {
-	return Image{
-		Name:   tag.Name,
-		NewTag: tag.NewTag,
-		Digest: tag.Digest,
-	}
-}

pkg/image/deprecatedimage.go

@@ -16,9 +16,10 @@ limitations under the License.
 
 package image
 
-// ImageTag contains an image and a new tag, which will replace the original tag.
+// DeprecatedImage contains an image and a new tag,
+// which will replace the original tag.
 // Deprecated, instead use Image.
-type ImageTag struct {
+type DeprecatedImage struct {
 	// Name is a tag-less image name.
 	Name string `json:"name,omitempty" yaml:"name,omitempty"`