Change-Id: Ie6d625728217ba8f8b14f6d1145568383b787587

Change-Id: I6258a4cffa053ffd53e40a3d5f70b860c3884bd7

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* added AutoflushFile.seek()
* added AutoflushFile.truncate()
* added CPUTimeManager.set_refresh_each()
* added satella.instrumentation.cpu_time.get_own_cpu_time()

Build process
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* added pylint

Change-Id: I0d82869d91767b7aabbdfcad0148b076799fa3e9

* added correct read() to DevNullFilelikeObject
* Proxy got _get_object()
* added tell(), seekable(), truncate() and seek() to DevNullFilelikeObject