esp_prov: Compatibility changes and refactoring

- Removed python 2 compatibility
- Removed dependencies on redundant external modules
- Interactive provisioning input for security scheme 2
- Style changes:
  Updated print statements to format strings
  Colored verbose logging
  Raised exceptions on errors instead of clean exits

tools/esp_prov/security/security0.py

@@ -1,25 +1,12 @@
-# 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
 #
 
 # APIs for interpreting and creating protobuf packets for
 # protocomm endpoint with security type protocomm_security0
 
-from __future__ import print_function
-
 import proto
-from future.utils import tobytes
+from utils import str_to_bytes
 
 from .security import Security
 
@@ -52,10 +39,10 @@ class Security0(Security):
     def setup0_response(self, response_data):
         # Interpret protocomm security0 response packet
         setup_resp = proto.session_pb2.SessionData()
-        setup_resp.ParseFromString(tobytes(response_data))
+        setup_resp.ParseFromString(str_to_bytes(response_data))
         # Check if security scheme matches
         if setup_resp.sec_ver != proto.session_pb2.SecScheme0:
-            print('Incorrect sec scheme')
+            raise RuntimeError('Incorrect security scheme')
 
     def encrypt_data(self, data):
         # Passive. No encryption when security0 used