Revert vendor directory to support old golang (GOPATH mode)

gomodule is still in progress to migrate for now, hence multus
team decide to keep vendor directory to support build without
gomodule.

vendor/github.com/onsi/ginkgo/internal/testingtproxy/testing_t_proxy.go

@@ -0,0 +1,76 @@
+package testingtproxy
+
+import (
+	"fmt"
+	"io"
+)
+
+type failFunc func(message string, callerSkip ...int)
+
+func New(writer io.Writer, fail failFunc, offset int) *ginkgoTestingTProxy {
+	return &ginkgoTestingTProxy{
+		fail:   fail,
+		offset: offset,
+		writer: writer,
+	}
+}
+
+type ginkgoTestingTProxy struct {
+	fail   failFunc
+	offset int
+	writer io.Writer
+}
+
+func (t *ginkgoTestingTProxy) Error(args ...interface{}) {
+	t.fail(fmt.Sprintln(args...), t.offset)
+}
+
+func (t *ginkgoTestingTProxy) Errorf(format string, args ...interface{}) {
+	t.fail(fmt.Sprintf(format, args...), t.offset)
+}
+
+func (t *ginkgoTestingTProxy) Fail() {
+	t.fail("failed", t.offset)
+}
+
+func (t *ginkgoTestingTProxy) FailNow() {
+	t.fail("failed", t.offset)
+}
+
+func (t *ginkgoTestingTProxy) Fatal(args ...interface{}) {
+	t.fail(fmt.Sprintln(args...), t.offset)
+}
+
+func (t *ginkgoTestingTProxy) Fatalf(format string, args ...interface{}) {
+	t.fail(fmt.Sprintf(format, args...), t.offset)
+}
+
+func (t *ginkgoTestingTProxy) Log(args ...interface{}) {
+	fmt.Fprintln(t.writer, args...)
+}
+
+func (t *ginkgoTestingTProxy) Logf(format string, args ...interface{}) {
+	fmt.Fprintf(t.writer, format, args...)
+}
+
+func (t *ginkgoTestingTProxy) Failed() bool {
+	return false
+}
+
+func (t *ginkgoTestingTProxy) Parallel() {
+}
+
+func (t *ginkgoTestingTProxy) Skip(args ...interface{}) {
+	fmt.Println(args...)
+}
+
+func (t *ginkgoTestingTProxy) Skipf(format string, args ...interface{}) {
+	fmt.Printf(format, args...)
+}
+
+func (t *ginkgoTestingTProxy) SkipNow() {
+}
+
+func (t *ginkgoTestingTProxy) Skipped() bool {
+	return false
+}