TUN-7590: Remove usages of ioutil

sshgen/sshgen.go

@@ -10,9 +10,9 @@ import (
 	"encoding/pem"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/url"
+	"os"
 	"time"
 
 	"github.com/go-jose/go-jose/v3/jwt"
@@ -148,7 +148,7 @@ func generateKeyPair(fullName string) ([]byte, error) {
 		return nil, err
 	}
 	if exist {
-		return ioutil.ReadFile(pubKeyName)
+		return os.ReadFile(pubKeyName)
 	}
 
 	key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
@@ -187,5 +187,5 @@ func writeKey(filename string, data []byte) error {
 		return err
 	}
 
-	return ioutil.WriteFile(filepath, data, 0600)
+	return os.WriteFile(filepath, data, 0600)
 }

sshgen/sshgen_test.go

@@ -7,7 +7,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
@@ -64,7 +63,7 @@ func TestCertGenSuccess(t *testing.T) {
 	mockRequest = func(url, contentType string, body io.Reader) (*http.Response, error) {
 		assert.Contains(t, "/cdn-cgi/access/cert_sign", url)
 		assert.Equal(t, "application/json", contentType)
-		buf, err := ioutil.ReadAll(body)
+		buf, err := io.ReadAll(body)
 		assert.NoError(t, err)
 		assert.NotEmpty(t, buf)
 		return w.Result(), nil