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/github.com/modern-go/reflect2/safe_field.go

@@ -0,0 +1,58 @@
+package reflect2
+
+import (
+	"reflect"
+	"unsafe"
+)
+
+type safeField struct {
+	reflect.StructField
+}
+
+func (field *safeField) Offset() uintptr {
+	return field.StructField.Offset
+}
+
+func (field *safeField) Name() string {
+	return field.StructField.Name
+}
+
+func (field *safeField) PkgPath() string {
+	return field.StructField.PkgPath
+}
+
+func (field *safeField) Type() Type {
+	panic("not implemented")
+}
+
+func (field *safeField) Tag() reflect.StructTag {
+	return field.StructField.Tag
+}
+
+func (field *safeField) Index() []int {
+	return field.StructField.Index
+}
+
+func (field *safeField) Anonymous() bool {
+	return field.StructField.Anonymous
+}
+
+func (field *safeField) Set(obj interface{}, value interface{}) {
+	val := reflect.ValueOf(obj).Elem()
+	val.FieldByIndex(field.Index()).Set(reflect.ValueOf(value).Elem())
+}
+
+func (field *safeField) UnsafeSet(obj unsafe.Pointer, value unsafe.Pointer) {
+	panic("unsafe operation is not supported")
+}
+
+func (field *safeField) Get(obj interface{}) interface{} {
+	val := reflect.ValueOf(obj).Elem().FieldByIndex(field.Index())
+	ptr := reflect.New(val.Type())
+	ptr.Elem().Set(val)
+	return ptr.Interface()
+}
+
+func (field *safeField) UnsafeGet(obj unsafe.Pointer) unsafe.Pointer {
+	panic("does not support unsafe operation")
+}