bugfix: import error in example tests

relative import error in lib_ble_client
import Queue error in blehr_test
import http server error in ota tests

examples/system/ota/advanced_https_ota/example_test.py

@@ -2,11 +2,16 @@ import re
 import os
 import sys
 import socket
-import BaseHTTPServer
-import SimpleHTTPServer
 from threading import Thread
 import ssl
 
+try:
+    import BaseHTTPServer
+    from SimpleHTTPServer import SimpleHTTPRequestHandler
+except ImportError:
+    import http.server as BaseHTTPServer
+    from http.server import SimpleHTTPRequestHandler
+
 try:
     import IDF
 except ImportError:
@@ -110,7 +115,7 @@ def get_ca_cert(ota_image_dir):
 def start_https_server(ota_image_dir, server_ip, server_port):
     server_file, key_file = get_ca_cert(ota_image_dir)
     httpd = BaseHTTPServer.HTTPServer((server_ip, server_port),
-                                      SimpleHTTPServer.SimpleHTTPRequestHandler)
+                                      SimpleHTTPRequestHandler)
 
     httpd.socket = ssl.wrap_socket(httpd.socket,
                                    keyfile=key_file,
@@ -128,7 +133,7 @@ def redirect_handler_factory(url):
     """
     Returns a request handler class that redirects to supplied `url`
     """
-    class RedirectHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
+    class RedirectHandler(SimpleHTTPRequestHandler):
         def do_GET(self):
             print("Sending resp, URL: " + url)
             self.send_response(301)