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/project.go

@@ -22,7 +22,6 @@ package fsquota
 import (
 	"bufio"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -267,7 +266,7 @@ func writeProjectFile(base *os.File, projects []projectType) (string, error) {
 		return "", err
 	}
 	mode := stat.Mode() & os.ModePerm
-	f, err := ioutil.TempFile(filepath.Dir(oname), filepath.Base(oname))
+	f, err := os.CreateTemp(filepath.Dir(oname), filepath.Base(oname))
 	if err != nil {
 		return "", err
 	}