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/apimachinery/pkg/util/diff/diff.go

@@ -0,0 +1,138 @@
+/*
+Copyright 2014 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 diff
+
+import (
+	"bytes"
+	"fmt"
+	"reflect"
+	"strings"
+	"text/tabwriter"
+
+	"github.com/google/go-cmp/cmp"
+	"k8s.io/apimachinery/pkg/util/dump"
+)
+
+func legacyDiff(a, b interface{}) string {
+	return cmp.Diff(a, b)
+}
+
+// StringDiff diffs a and b and returns a human readable diff.
+// DEPRECATED: use github.com/google/go-cmp/cmp.Diff
+func StringDiff(a, b string) string {
+	return legacyDiff(a, b)
+}
+
+// ObjectDiff prints the diff of two go objects and fails if the objects
+// contain unhandled unexported fields.
+// DEPRECATED: use github.com/google/go-cmp/cmp.Diff
+func ObjectDiff(a, b interface{}) string {
+	return legacyDiff(a, b)
+}
+
+// ObjectGoPrintDiff prints the diff of two go objects and fails if the objects
+// contain unhandled unexported fields.
+// DEPRECATED: use github.com/google/go-cmp/cmp.Diff
+func ObjectGoPrintDiff(a, b interface{}) string {
+	return legacyDiff(a, b)
+}
+
+// ObjectReflectDiff prints the diff of two go objects and fails if the objects
+// contain unhandled unexported fields.
+// DEPRECATED: use github.com/google/go-cmp/cmp.Diff
+func ObjectReflectDiff(a, b interface{}) string {
+	return legacyDiff(a, b)
+}
+
+// ObjectGoPrintSideBySide prints a and b as textual dumps side by side,
+// enabling easy visual scanning for mismatches.
+func ObjectGoPrintSideBySide(a, b interface{}) string {
+	sA := dump.Pretty(a)
+	sB := dump.Pretty(b)
+
+	linesA := strings.Split(sA, "\n")
+	linesB := strings.Split(sB, "\n")
+	width := 0
+	for _, s := range linesA {
+		l := len(s)
+		if l > width {
+			width = l
+		}
+	}
+	for _, s := range linesB {
+		l := len(s)
+		if l > width {
+			width = l
+		}
+	}
+	buf := &bytes.Buffer{}
+	w := tabwriter.NewWriter(buf, width, 0, 1, ' ', 0)
+	max := len(linesA)
+	if len(linesB) > max {
+		max = len(linesB)
+	}
+	for i := 0; i < max; i++ {
+		var a, b string
+		if i < len(linesA) {
+			a = linesA[i]
+		}
+		if i < len(linesB) {
+			b = linesB[i]
+		}
+		fmt.Fprintf(w, "%s\t%s\n", a, b)
+	}
+	w.Flush()
+	return buf.String()
+}
+
+// IgnoreUnset is an option that ignores fields that are unset on the right
+// hand side of a comparison. This is useful in testing to assert that an
+// object is a derivative.
+func IgnoreUnset() cmp.Option {
+	return cmp.Options{
+		// ignore unset fields in v2
+		cmp.FilterPath(func(path cmp.Path) bool {
+			_, v2 := path.Last().Values()
+			switch v2.Kind() {
+			case reflect.Slice, reflect.Map:
+				if v2.IsNil() || v2.Len() == 0 {
+					return true
+				}
+			case reflect.String:
+				if v2.Len() == 0 {
+					return true
+				}
+			case reflect.Interface, reflect.Pointer:
+				if v2.IsNil() {
+					return true
+				}
+			}
+			return false
+		}, cmp.Ignore()),
+		// ignore map entries that aren't set in v2
+		cmp.FilterPath(func(path cmp.Path) bool {
+			switch i := path.Last().(type) {
+			case cmp.MapIndex:
+				if _, v2 := i.Values(); !v2.IsValid() {
+					fmt.Println("E")
+					return true
+				}
+			}
+			return false
+		}, cmp.Ignore()),
+	}
+}