cleanup pyc files between running pytest

this is need to avoid problem sometimes tests are run inside docker
container and sometimes local.

Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/_pytest/config/__init__.py", line 409, in _importconftest
mod = conftestpath.pyimport()
File "/usr/lib/python2.7/dist-packages/py/_path/local.py", line 686, in pyimport
raise self.ImportMismatchError(modname, modfile, self)
ImportMismatchError: ('conftest', '/beremiz/tests/tools/conftest.py', local('/home/developer/beremiz/tests/tools/conftest.py'))
ERROR: could not load /home/developer/beremiz/tests/tools/conftest.py

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#!/usr/bin/env python

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# -*- coding: utf-8 -*-

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# See COPYING.Runtime file for copyrights details.

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LogLevels = ["CRITICAL", "WARNING", "INFO", "DEBUG"]

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LogLevelsCount = len(LogLevels)

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LogLevelsDict = dict(zip(LogLevels, range(LogLevelsCount)))

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LogLevelsDefault = LogLevelsDict["DEBUG"]