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/controller-manager/pkg/features/OWNERS

@@ -0,0 +1,4 @@
+# See the OWNERS docs at https://go.k8s.io/owners
+
+approvers:
+  - feature-approvers

e2e/vendor/k8s.io/controller-manager/pkg/features/kube_features.go

@@ -0,0 +1,51 @@
+/*
+Copyright 2020 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 features
+
+import (
+	"k8s.io/apimachinery/pkg/util/version"
+	"k8s.io/component-base/featuregate"
+)
+
+const (
+	// Every feature gate should add method here following this template:
+	//
+	// // owner: @username
+	// MyFeature featuregate.Feature = "MyFeature"
+	//
+	// Feature gates should be listed in alphabetical, case-sensitive
+	// (upper before any lower case character) order. This reduces the risk
+	// of code conflicts because changes are more likely to be scattered
+	// across the file.
+
+	// owner: @nckturner
+	// kep:  http://kep.k8s.io/2699
+	// Enable webhook in cloud controller manager
+	CloudControllerManagerWebhook featuregate.Feature = "CloudControllerManagerWebhook"
+)
+
+func SetupCurrentKubernetesSpecificFeatureGates(featuregates featuregate.MutableVersionedFeatureGate) error {
+	return featuregates.AddVersioned(versionedCloudPublicFeatureGates)
+}
+
+// versionedCloudPublicFeatureGates consists of versioned cloud-specific feature keys.
+// To add a new feature, define a key for it above and add it here.
+var versionedCloudPublicFeatureGates = map[featuregate.Feature]featuregate.VersionedSpecs{
+	CloudControllerManagerWebhook: {
+		{Version: version.MustParse("1.27"), Default: false, PreRelease: featuregate.Alpha},
+	},
+}

e2e/vendor/k8s.io/controller-manager/pkg/features/register/register.go

@@ -0,0 +1,27 @@
+/*
+Copyright 2020 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 register
+
+import (
+	"k8s.io/apimachinery/pkg/util/runtime"
+	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	"k8s.io/controller-manager/pkg/features"
+)
+
+func init() {
+	runtime.Must(features.SetupCurrentKubernetesSpecificFeatureGates(utilfeature.DefaultMutableFeatureGate))
+}