Update kube-openapi (#108895)

* upgrade k8s.io/kube-openapi

* fix open-api v3 blank aggregator output

* use keys as API group

in ./hack/update-openapi-spec.sh

* fix import grouping

* update openapiv3 integration tests

vendor/k8s.io/kube-openapi/pkg/util/proto/testing/openapi_v3.go

@@ -0,0 +1,71 @@
+/*
+Copyright 2022 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 testing
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"sync"
+
+	openapi_v3 "github.com/google/gnostic/openapiv3"
+)
+
+type FakeV3 struct {
+	Path string
+
+	lock      sync.Mutex
+	documents map[string]*openapi_v3.Document
+	errors    map[string]error
+}
+
+func (f *FakeV3) OpenAPIV3Schema(groupVersion string) (*openapi_v3.Document, error) {
+	f.lock.Lock()
+	defer f.lock.Unlock()
+
+	if existing, ok := f.documents[groupVersion]; ok {
+		return existing, nil
+	} else if existingError, ok := f.errors[groupVersion]; ok {
+		return nil, existingError
+	}
+
+	_, err := os.Stat(f.Path)
+	if err != nil {
+		return nil, err
+	}
+	spec, err := ioutil.ReadFile(filepath.Join(f.Path, groupVersion+".json"))
+	if err != nil {
+		return nil, err
+	}
+
+	if f.documents == nil {
+		f.documents = make(map[string]*openapi_v3.Document)
+	}
+
+	if f.errors == nil {
+		f.errors = make(map[string]error)
+	}
+
+	result, err := openapi_v3.ParseDocument(spec)
+	if err != nil {
+		f.errors[groupVersion] = err
+		return nil, err
+	}
+
+	f.documents[groupVersion] = result
+	return result, nil
+}