fix: enable_shell_access.py: correct connection errors handling.

enable_shell_access.py

@@ -162,7 +162,7 @@ if __name__ == '__main__':
         if input('Config successfully uploaded. Do you want to reboot ONU now? (Y/n) : ').lower() != 'n':
             try:
                 resp = http.post('/post.json', json={'module': 'dev_config', 'reboot': 1})
-            except (httpx.ConnectError, httpx.ReadError):
+            except (httpx.TimeoutException, httpx.NetworkError):
                 print('ONU reboot error. The device is probably already rebooting.')
                 sys.exit(0)
             else: