multi: replace ioutil.ReadDir

lntest/btcd.go

@@ -7,7 +7,6 @@ import (
 	"encoding/hex"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strings"
 
@@ -135,7 +134,7 @@ func NewBackend(miner string, netParams *chaincfg.Params) (
 		// the log files, including any compressed log files from
 		// logrorate, before deleting the temporary log dir.
 		logDir := fmt.Sprintf("%s/%s", baseLogDir, netParams.Name)
-		files, err := ioutil.ReadDir(logDir)
+		files, err := os.ReadDir(logDir)
 		if err != nil {
 			errStr += fmt.Sprintf(
 				"unable to read log directory: %v\n", err,

lntest/harness_miner.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -121,7 +120,7 @@ func (h *HarnessMiner) saveLogs() {
 	// After shutting down the miner, we'll make a copy of the log files
 	// before deleting the temporary log dir.
 	path := fmt.Sprintf("%s/%s", h.logPath, harnessNetParams.Name)
-	files, err := ioutil.ReadDir(path)
+	files, err := os.ReadDir(path)
 	require.NoError(h, err, "unable to read log directory")
 
 	for _, file := range files {

lntest/node/harness_node.go

@@ -1032,7 +1032,7 @@ func addLogFile(hn *HarnessNode) error {
 // copyAll copies all files and directories from srcDir to dstDir recursively.
 // Note that this function does not support links.
 func copyAll(dstDir, srcDir string) error {
-	entries, err := ioutil.ReadDir(srcDir)
+	entries, err := os.ReadDir(srcDir)
 	if err != nil {
 		return err
 	}