storage: stop using deprecated io/ioutil

This replaces deprecated ioutil variables and functions as follows:

* ioutil.ReadDir -> os.ReadDir
* ioutil.ReadFile -> os.ReadFile
* ioutil.TempDir -> os.MkdirTemp
* ioutil.TempFile -> os.CreateTemp
* ioutil.WriteFile -> os.WriteFile

The ReadDir conversion involves an API change, the replacement
function returns a slice of fs.DirEntry instead of fs.FileInfo.
Where appropriate, the surrounding code has been adjusted; mostly,
that means using DirEntry.Type() instead of FileInfo.Mode().
Applying this change to the IoUtil interface would mean changing its
API, so this is left for later.

Signed-off-by: Stephen Kitt <skitt@redhat.com>

pkg/volume/util/fsquota/common/quota_common_linux_impl.go

@@ -22,7 +22,6 @@ package common
 import (
 	"bufio"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"regexp"
@@ -144,7 +143,7 @@ func doRunXFSQuotaCommand(mountpoint string, mountsFile, command string) (string
 // See https://bugzilla.redhat.com/show_bug.cgi?id=237120 for an example
 // of the problem that could be caused if this were to happen.
 func runXFSQuotaCommand(mountpoint string, command string) (string, error) {
-	tmpMounts, err := ioutil.TempFile("", "mounts")
+	tmpMounts, err := os.CreateTemp("", "mounts")
 	if err != nil {
 		return "", fmt.Errorf("cannot create temporary mount file: %v", err)
 	}