Drop ioutil package.

Signed-off-by: zhanluxianshen <[email protected]>

exec/executor_ssh.go

@@ -19,14 +19,15 @@ package exec
 import (
 	"context"
 	"fmt"
-	"github.com/chaosblade-io/chaosblade-spec-go/log"
-	"io/ioutil"
 	"net"
+	"os"
 	"path"
 	"strconv"
 	"strings"
 	"time"
 
+	"github.com/chaosblade-io/chaosblade-spec-go/log"
+
 	"github.com/chaosblade-io/chaosblade-exec-os/version"
 
 	"github.com/chaosblade-io/chaosblade-spec-go/spec"
@@ -284,7 +285,7 @@ func (c *SSHClient) connect() error {
 	if c.Key == "" {
 		auth = append(auth, ssh.Password(c.Password))
 	} else {
-		pemBytes, err := ioutil.ReadFile(c.Key)
+		pemBytes, err := os.ReadFile(c.Key)
 		if err != nil {
 			return err
 		}

exec/nginx/nginx_test.go

@@ -20,7 +20,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"strings"
 	"testing"
@@ -89,7 +89,7 @@ func (tc *testCase) expectResponse(ctx context.Context, path, respBody string, r
 		tc.t.Fatal(err.Error())
 	}
 	defer resp.Body.Close()
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	bodyString := strings.TrimSpace(string(body[:]))
 	if err != nil {
 		tc.t.Fatal(err.Error())