add couple Beremiz application tests

These tests trigger around 45% of python code.
Used in tests docker files are avaiable here:
https://bitbucket.org/skvorl/beremiz-dockerfiles

Beremiz's user manual
=====================

Contents:

.. toctree::
   :maxdepth: 2

   install
   start
   edit
   build
   connectors
   debug