Werk #7628: snap7: Fixed missing python modules

Component	Other components
Title	snap7: Fixed missing python modules
Date	Feb 1, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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