replace "dep" with "go mod"

A simple "go mod init && go mod tidy && go mod vendor" was enough and
mostly seems to have picked the same revisions of the dependencies as
before. Notable exceptions are klog and gogo/protobuf.

vendor/k8s.io/code-generator/pkg/namer/tag-override.go

@@ -1,58 +0,0 @@
-/*
-Copyright 2016 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 namer
-
-import (
-	"k8s.io/gengo/namer"
-	"k8s.io/gengo/types"
-)
-
-// TagOverrideNamer is a namer which pulls names from a given tag, if specified,
-// and otherwise falls back to a different namer.
-type TagOverrideNamer struct {
-	tagName  string
-	fallback namer.Namer
-}
-
-// Name returns the tag value if it exists. It no tag was found the fallback namer will be used
-func (n *TagOverrideNamer) Name(t *types.Type) string {
-	if nameOverride := extractTag(n.tagName, append(t.SecondClosestCommentLines, t.CommentLines...)); nameOverride != "" {
-		return nameOverride
-	}
-
-	return n.fallback.Name(t)
-}
-
-// NewTagOverrideNamer creates a namer.Namer which uses the contents of the given tag as
-// the name, or falls back to another Namer if the tag is not present.
-func NewTagOverrideNamer(tagName string, fallback namer.Namer) namer.Namer {
-	return &TagOverrideNamer{
-		tagName:  tagName,
-		fallback: fallback,
-	}
-}
-
-// extractTag gets the comment-tags for the key.  If the tag did not exist, it
-// returns the empty string.
-func extractTag(key string, lines []string) string {
-	val, present := types.ExtractCommentTags("+", lines)[key]
-	if !present || len(val) < 1 {
-		return ""
-	}
-
-	return val[0]
-}

vendor/k8s.io/code-generator/pkg/util/build.go

@@ -1,61 +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 util
-
-import (
-	gobuild "go/build"
-	"path"
-	"path/filepath"
-	"reflect"
-	"strings"
-)
-
-type empty struct{}
-
-// CurrentPackage returns the go package of the current directory, or "" if it cannot
-// be derived from the GOPATH.
-func CurrentPackage() string {
-	for _, root := range gobuild.Default.SrcDirs() {
-		if pkg, ok := hasSubdir(root, "."); ok {
-			return pkg
-		}
-	}
-	return ""
-}
-
-func hasSubdir(root, dir string) (rel string, ok bool) {
-	// ensure a tailing separator to properly compare on word-boundaries
-	const sep = string(filepath.Separator)
-	root = filepath.Clean(root)
-	if !strings.HasSuffix(root, sep) {
-		root += sep
-	}
-
-	// check whether root dir starts with root
-	dir = filepath.Clean(dir)
-	if !strings.HasPrefix(dir, root) {
-		return "", false
-	}
-
-	// cut off root
-	return filepath.ToSlash(dir[len(root):]), true
-}
-
-// BoilerplatePath uses the boilerplate in code-generator by calculating the relative path to it.
-func BoilerplatePath() string {
-	return path.Join(reflect.TypeOf(empty{}).PkgPath(), "/../../hack/boilerplate.go.txt")
-}