add prune and remove unused packages

vendor/k8s.io/kube-openapi/pkg/generators/rules/doc.go

@@ -1,23 +0,0 @@
-/*
-Copyright 2018 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 rules contains API rules that are enforced in OpenAPI spec generation
-// as part of the machinery. Files under this package implement APIRule interface
-// which evaluates Go type and produces list of API rule violations.
-//
-// Implementations of APIRule should be added to API linter under openAPIGen code-
-// generator to get integrated in the generation process.
-package rules