Tests: Enhance robustness of stdout driven waiting state in Sikuli based tests.

Some tests were randomly passing, because from time to time waiting for idle was skiped. It was combination of multiple problems :
- buffering on stdout (now use readline + flush for each write to log)
- it is sometime required to wait for activity before waiting for timeout added "WaitForChangeAndIdle" to "stdoutIdleObserver"

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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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#