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/pod-security-admission/policy/check_hostPathVolumes.go

@@ -0,0 +1,76 @@
+/*
+Copyright 2021 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 policy
+
+import (
+	"fmt"
+
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/pod-security-admission/api"
+)
+
+/*
+HostPath volumes must be forbidden.
+
+**Restricted Fields:**
+
+spec.volumes[*].hostPath
+
+**Allowed Values:** undefined/null
+*/
+
+func init() {
+	addCheck(CheckHostPathVolumes)
+}
+
+const checkHostPathVolumesID CheckID = "hostPathVolumes"
+
+// CheckHostPathVolumes returns a baseline level check
+// that requires hostPath=undefined/null in 1.0+
+func CheckHostPathVolumes() Check {
+	return Check{
+		ID:    checkHostPathVolumesID,
+		Level: api.LevelBaseline,
+		Versions: []VersionedCheck{
+			{
+				MinimumVersion: api.MajorMinorVersion(1, 0),
+				CheckPod:       hostPathVolumes_1_0,
+			},
+		},
+	}
+}
+
+func hostPathVolumes_1_0(podMetadata *metav1.ObjectMeta, podSpec *corev1.PodSpec) CheckResult {
+	var hostVolumes []string
+
+	for _, volume := range podSpec.Volumes {
+		if volume.HostPath != nil {
+			hostVolumes = append(hostVolumes, volume.Name)
+		}
+	}
+
+	if len(hostVolumes) > 0 {
+		return CheckResult{
+			Allowed:         false,
+			ForbiddenReason: "hostPath volumes",
+			ForbiddenDetail: fmt.Sprintf("%s %s", pluralize("volume", "volumes", len(hostVolumes)), joinQuote(hostVolumes)),
+		}
+	}
+
+	return CheckResult{Allowed: true}
+}