add prune and remove unused packages

vendor/k8s.io/code-generator/cmd/go-to-protobuf/protoc-gen-gogo/main.go

@@ -1,32 +0,0 @@
-/*
-Copyright 2015 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 main defines the protoc-gen-gogo binary we use to generate our proto go files,
-// as well as takes dependencies on the correct gogo/protobuf packages for godeps.
-package main
-
-import (
-	"github.com/gogo/protobuf/vanity/command"
-
-	// dependencies that are required for our packages
-	_ "github.com/gogo/protobuf/gogoproto"
-	_ "github.com/gogo/protobuf/proto"
-	_ "github.com/gogo/protobuf/sortkeys"
-)
-
-func main() {
-	command.Write(command.Generate(command.Read()))
-}