refactor: move from io/ioutil to io and os package

The io/ioutil package has been deprecated as of Go 1.16, see
https://golang.org/doc/go1.16#ioutil. This commit replaces the existing
io/ioutil functions with their new definitions in io and os packages.

Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

pkg/cri/store/container/status.go

@@ -18,7 +18,6 @@ package container
 
 import (
 	"encoding/json"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"sync"
@@ -182,7 +181,7 @@ func StoreStatus(root, id string, status Status) (StatusStorage, error) {
 // writing to the file during loading.
 func LoadStatus(root, id string) (Status, error) {
 	path := filepath.Join(root, "status")
-	data, err := ioutil.ReadFile(path)
+	data, err := os.ReadFile(path)
 	if err != nil {
 		return Status{}, errors.Wrapf(err, "failed to read status from %q", path)
 	}

pkg/cri/store/container/status_test.go

@@ -19,7 +19,6 @@ package container
 import (
 	"encoding/json"
 	"errors"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -115,7 +114,7 @@ func TestStatus(t *testing.T) {
 	assert := assertlib.New(t)
 	require := requirelib.New(t)
 
-	tempDir, err := ioutil.TempDir(os.TempDir(), "status-test")
+	tempDir, err := os.MkdirTemp(os.TempDir(), "status-test")
 	require.NoError(err)
 	defer os.RemoveAll(tempDir)
 	statusFile := filepath.Join(tempDir, "status")