Werk #6055: Updated Python to 2.7.15

Component	Other components
Title	Updated Python to 2.7.15
Date	May 2, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0b3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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