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/onsi/gomega/internal/gutil/post_ioutil.go

@@ -0,0 +1,48 @@
+//go:build go1.16
+// +build go1.16
+
+// Package gutil is a replacement for ioutil, which should not be used in new
+// code as of Go 1.16. With Go 1.16 and higher, this implementation
+// uses the ioutil replacement functions in "io" and "os" with some
+// Gomega specifics. This means that we should not get deprecation warnings
+// for ioutil when they are added.
+package gutil
+
+import (
+	"io"
+	"os"
+)
+
+func NopCloser(r io.Reader) io.ReadCloser {
+	return io.NopCloser(r)
+}
+
+func ReadAll(r io.Reader) ([]byte, error) {
+	return io.ReadAll(r)
+}
+
+func ReadDir(dirname string) ([]string, error) {
+	entries, err := os.ReadDir(dirname)
+	if err != nil {
+		return nil, err
+	}
+
+	var names []string
+	for _, entry := range entries {
+		names = append(names, entry.Name())
+	}
+
+	return names, nil
+}
+
+func ReadFile(filename string) ([]byte, error) {
+	return os.ReadFile(filename)
+}
+
+func MkdirTemp(dir, pattern string) (string, error) {
+	return os.MkdirTemp(dir, pattern)
+}
+
+func WriteFile(filename string, data []byte) error {
+	return os.WriteFile(filename, data, 0644)
+}

e2e/vendor/github.com/onsi/gomega/internal/gutil/using_ioutil.go

@@ -0,0 +1,47 @@
+//go:build !go1.16
+// +build !go1.16
+
+// Package gutil is a replacement for ioutil, which should not be used in new
+// code as of Go 1.16. With Go 1.15 and lower, this implementation
+// uses the ioutil functions, meaning that although Gomega is not officially
+// supported on these versions, it is still likely to work.
+package gutil
+
+import (
+	"io"
+	"io/ioutil"
+)
+
+func NopCloser(r io.Reader) io.ReadCloser {
+	return ioutil.NopCloser(r)
+}
+
+func ReadAll(r io.Reader) ([]byte, error) {
+	return ioutil.ReadAll(r)
+}
+
+func ReadDir(dirname string) ([]string, error) {
+	files, err := ioutil.ReadDir(dirname)
+	if err != nil {
+		return nil, err
+	}
+
+	var names []string
+	for _, file := range files {
+		names = append(names, file.Name())
+	}
+
+	return names, nil
+}
+
+func ReadFile(filename string) ([]byte, error) {
+	return ioutil.ReadFile(filename)
+}
+
+func MkdirTemp(dir, pattern string) (string, error) {
+	return ioutil.TempDir(dir, pattern)
+}
+
+func WriteFile(filename string, data []byte) error {
+	return ioutil.WriteFile(filename, data, 0644)
+}