all: replace io/ioutil with io and os package

For golang/go#45557

Change-Id: I447530cc66896aef7a8d528ccb8d095b80e3cf47
GitHub-Last-Rev: 5f385ff46487ac318bd1147cdbbd26bb0ffd0426
GitHub-Pull-Request: golang/crypto#230
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/430797
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Meng Zhuo <mzh@golangcn.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>

ssh/test/dial_unix_test.go

@@ -12,7 +12,6 @@ package test
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net"
 	"strings"
 	"testing"
@@ -55,7 +54,7 @@ func testDial(t *testing.T, n, listenAddr string, x dialTester) {
 	}
 	x.TestClientConn(t, conn)
 	defer conn.Close()
-	b, err := ioutil.ReadAll(conn)
+	b, err := io.ReadAll(conn)
 	if err != nil {
 		t.Fatalf("ReadAll: %v", err)
 	}

ssh/test/forward_unix_test.go

@@ -11,7 +11,6 @@ import (
 	"bytes"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"math/rand"
 	"net"
 	"testing"
@@ -58,7 +57,7 @@ func testPortForward(t *testing.T, n, listenAddr string) {
 
 	readChan := make(chan []byte)
 	go func() {
-		data, _ := ioutil.ReadAll(netConn)
+		data, _ := io.ReadAll(netConn)
 		readChan <- data
 	}()
 

ssh/test/test_unix_test.go

@@ -14,7 +14,6 @@ import (
 	"crypto/rand"
 	"encoding/base64"
 	"fmt"
-	"io/ioutil"
 	"log"
 	"net"
 	"os"
@@ -151,7 +150,7 @@ func clientConfig() *ssh.ClientConfig {
 // is used for connecting the Go SSH client with sshd without opening
 // ports.
 func unixConnection() (*net.UnixConn, *net.UnixConn, error) {
-	dir, err := ioutil.TempDir("", "unixConnection")
+	dir, err := os.MkdirTemp("", "unixConnection")
 	if err != nil {
 		return nil, nil, err
 	}
@@ -316,7 +315,7 @@ func newServerForConfig(t *testing.T, config string, configVars map[string]strin
 	if uname == "root" {
 		t.Skip("skipping test because current user is root")
 	}
-	dir, err := ioutil.TempDir("", "sshtest")
+	dir, err := os.MkdirTemp("", "sshtest")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -365,7 +364,7 @@ func newServerForConfig(t *testing.T, config string, configVars map[string]strin
 }
 
 func newTempSocket(t *testing.T) (string, func()) {
-	dir, err := ioutil.TempDir("", "socket")
+	dir, err := os.MkdirTemp("", "socket")
 	if err != nil {
 		t.Fatal(err)
 	}