Werk #7590: Check_MK is now shipping with own Python 2.7.12 interpreter

This step has been made to make Python based components, like Check_MK, be able to rely on one single Python version independent of the distibution OMD is being installed on.

Python scripts should use "#!/usr/bin/env python" as shebang to be working within OMD without change. Something like "#!/usr/bin/python" would not use the interpreter shipped with OMD.

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