tools: remove the dependency on the future package

examples/protocols/http_server/advanced_tests/scripts/test.py

@@ -1,18 +1,7 @@
 #!/usr/bin/env python
 #
-# Copyright 2018 Espressif Systems (Shanghai) PTE LTD
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
+# SPDX-FileCopyrightText: 2018-2022 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: Apache-2.0
 
 # Utility for testing the web server. Test cases:
 # Assume the device supports 'n' simultaneous open sockets
@@ -139,7 +128,6 @@ import string
 import sys
 import threading
 import time
-from builtins import object, range, str
 
 try:
     import Utility