Werk #8398: Fix CMK style graphs when special characters like - or @ are contained in the variable names

Component	The Checkmk Micro Core
Title	Fix CMK style graphs when special characters like - or @ are contained in the variable names
Date	Feb 15, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Enterprise (CEE), Checkmk MSP (CME)

This e.g. affected storage checks on ESX where a - appears in the name of the storage volume.

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