build: move e2e dependencies into e2e/go.mod

Several packages are only used while running the e2e suite. These
packages are less important to update, as the they can not influence the
final executable that is part of the Ceph-CSI container-image.

By moving these dependencies out of the main Ceph-CSI go.mod, it is
easier to identify if a reported CVE affects Ceph-CSI, or only the
testing (like most of the Kubernetes CVEs).

Signed-off-by: Niels de Vos <ndevos@ibm.com>

e2e/vendor/k8s.io/apiserver/pkg/admission/initializer/initializer.go

@@ -0,0 +1,95 @@
+/*
+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 initializer
+
+import (
+	"k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apiserver/pkg/admission"
+	"k8s.io/apiserver/pkg/authorization/authorizer"
+	"k8s.io/client-go/dynamic"
+	"k8s.io/client-go/informers"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/component-base/featuregate"
+)
+
+type pluginInitializer struct {
+	externalClient    kubernetes.Interface
+	dynamicClient     dynamic.Interface
+	externalInformers informers.SharedInformerFactory
+	authorizer        authorizer.Authorizer
+	featureGates      featuregate.FeatureGate
+	stopCh            <-chan struct{}
+	restMapper        meta.RESTMapper
+}
+
+// New creates an instance of admission plugins initializer.
+// This constructor is public with a long param list so that callers immediately know that new information can be expected
+// during compilation when they update a level.
+func New(
+	extClientset kubernetes.Interface,
+	dynamicClient dynamic.Interface,
+	extInformers informers.SharedInformerFactory,
+	authz authorizer.Authorizer,
+	featureGates featuregate.FeatureGate,
+	stopCh <-chan struct{},
+	restMapper meta.RESTMapper,
+) pluginInitializer {
+	return pluginInitializer{
+		externalClient:    extClientset,
+		dynamicClient:     dynamicClient,
+		externalInformers: extInformers,
+		authorizer:        authz,
+		featureGates:      featureGates,
+		stopCh:            stopCh,
+		restMapper:        restMapper,
+	}
+}
+
+// Initialize checks the initialization interfaces implemented by a plugin
+// and provide the appropriate initialization data
+func (i pluginInitializer) Initialize(plugin admission.Interface) {
+	// First tell the plugin about drained notification, so it can pass it to further initializations.
+	if wants, ok := plugin.(WantsDrainedNotification); ok {
+		wants.SetDrainedNotification(i.stopCh)
+	}
+
+	// Second tell the plugin about enabled features, so it can decide whether to start informers or not
+	if wants, ok := plugin.(WantsFeatures); ok {
+		wants.InspectFeatureGates(i.featureGates)
+	}
+
+	if wants, ok := plugin.(WantsExternalKubeClientSet); ok {
+		wants.SetExternalKubeClientSet(i.externalClient)
+	}
+
+	if wants, ok := plugin.(WantsDynamicClient); ok {
+		wants.SetDynamicClient(i.dynamicClient)
+	}
+
+	if wants, ok := plugin.(WantsExternalKubeInformerFactory); ok {
+		wants.SetExternalKubeInformerFactory(i.externalInformers)
+	}
+
+	if wants, ok := plugin.(WantsAuthorizer); ok {
+		wants.SetAuthorizer(i.authorizer)
+	}
+	if wants, ok := plugin.(WantsRESTMapper); ok {
+		wants.SetRESTMapper(i.restMapper)
+	}
+}
+
+var _ admission.PluginInitializer = pluginInitializer{}

e2e/vendor/k8s.io/apiserver/pkg/admission/initializer/interfaces.go

@@ -0,0 +1,99 @@
+/*
+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 initializer
+
+import (
+	"k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apiserver/pkg/admission"
+	"k8s.io/apiserver/pkg/authorization/authorizer"
+	"k8s.io/apiserver/pkg/cel/openapi/resolver"
+	quota "k8s.io/apiserver/pkg/quota/v1"
+	"k8s.io/client-go/dynamic"
+	"k8s.io/client-go/informers"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/component-base/featuregate"
+)
+
+// WantsExternalKubeClientSet defines a function which sets external ClientSet for admission plugins that need it
+type WantsExternalKubeClientSet interface {
+	SetExternalKubeClientSet(kubernetes.Interface)
+	admission.InitializationValidator
+}
+
+// WantsExternalKubeInformerFactory defines a function which sets InformerFactory for admission plugins that need it
+type WantsExternalKubeInformerFactory interface {
+	SetExternalKubeInformerFactory(informers.SharedInformerFactory)
+	admission.InitializationValidator
+}
+
+// WantsAuthorizer defines a function which sets Authorizer for admission plugins that need it.
+type WantsAuthorizer interface {
+	SetAuthorizer(authorizer.Authorizer)
+	admission.InitializationValidator
+}
+
+// WantsQuotaConfiguration defines a function which sets quota configuration for admission plugins that need it.
+type WantsQuotaConfiguration interface {
+	SetQuotaConfiguration(quota.Configuration)
+	admission.InitializationValidator
+}
+
+// WantsDrainedNotification defines a function which sets the notification of where the apiserver
+// has already been drained for admission plugins that need it.
+// After receiving that notification, Admit/Validate calls won't be called anymore.
+type WantsDrainedNotification interface {
+	SetDrainedNotification(<-chan struct{})
+	admission.InitializationValidator
+}
+
+// WantsFeatureGate defines a function which passes the featureGates for inspection by an admission plugin.
+// Admission plugins should not hold a reference to the featureGates.  Instead, they should query a particular one
+// and assign it to a simple bool in the admission plugin struct.
+//
+//	func (a *admissionPlugin) InspectFeatureGates(features featuregate.FeatureGate){
+//	    a.myFeatureIsOn = features.Enabled("my-feature")
+//	}
+type WantsFeatures interface {
+	InspectFeatureGates(featuregate.FeatureGate)
+	admission.InitializationValidator
+}
+
+type WantsDynamicClient interface {
+	SetDynamicClient(dynamic.Interface)
+	admission.InitializationValidator
+}
+
+// WantsRESTMapper defines a function which sets RESTMapper for admission plugins that need it.
+type WantsRESTMapper interface {
+	SetRESTMapper(meta.RESTMapper)
+	admission.InitializationValidator
+}
+
+// WantsSchemaResolver defines a function which sets the SchemaResolver for
+// an admission plugin that needs it.
+type WantsSchemaResolver interface {
+	SetSchemaResolver(resolver resolver.SchemaResolver)
+	admission.InitializationValidator
+}
+
+// WantsExcludedAdmissionResources defines a function which sets the ExcludedAdmissionResources
+// for an admission plugin that needs it.
+type WantsExcludedAdmissionResources interface {
+	SetExcludedAdmissionResources(excludedAdmissionResources []schema.GroupResource)
+	admission.InitializationValidator
+}