Replace golang.org/x/net/context with std library

Signed-off-by: Shengjing Zhu <zhsj@debian.org>

pkg/cri/io/helpers.go

@@ -17,6 +17,7 @@
 package io
 
 import (
+	"context"
 	"io"
 	"os"
 	"path/filepath"
@@ -24,7 +25,6 @@ import (
 	"syscall"
 
 	"github.com/containerd/containerd/cio"
-	"golang.org/x/net/context"
 	runtime "k8s.io/cri-api/pkg/apis/runtime/v1"
 )
 

pkg/cri/io/helpers_unix.go

@@ -20,11 +20,11 @@
 package io
 
 import (
+	"context"
 	"io"
 	"os"
 
 	"github.com/containerd/fifo"
-	"golang.org/x/net/context"
 )
 
 func openPipe(ctx context.Context, fn string, flag int, perm os.FileMode) (io.ReadWriteCloser, error) {

pkg/cri/io/helpers_windows.go

@@ -17,6 +17,7 @@
 package io
 
 import (
+	"context"
 	"fmt"
 	"io"
 	"net"
@@ -24,7 +25,6 @@ import (
 	"sync"
 
 	winio "github.com/Microsoft/go-winio"
-	"golang.org/x/net/context"
 )
 
 type pipe struct {