Add OPC-UA simple synchronous client extension.

This extension uses python-opcua to growse server nodes, and generates runtime C code that use open62541.
- python-opcua must be available in python path (i.e. "import opcua" must succeed). Can be installed from pypi with "python2 -m pip install opcua --user" .
- at build time, open62541 is expected to be build in "open62541" directory, aside "beremiz" directory.

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# opcua/__init__.py

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from __future__ import absolute_import

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from .client import OPCUAClient

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# class RootClass(object):

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#     XSD = """<?xml version="1.0" encoding="ISO-8859-1" ?>

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#     <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

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#     </xsd:schema>

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#     """

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#     CTNChildrenTypes = [("OPCUAClient", OPCUAClient, "OPCUA Client")]

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#