OPC-US client: add support for x509 and user+password authentication.
Commit for backup not including tests since encrypted OPC-UA test are still not valid.
#!/usr/bin/env python# -*- coding: utf-8 -*-# This file is part of Beremiz# Copyright (C) 2019: Edouard TISSERANT## See COPYING file for copyrights details.from __future__ import absolute_importfrom svghmi.svghmi import *