Werk #8268: Fixed broken Filesystem growth graphs

Component	Metrics system
Title	Fixed broken Filesystem growth graphs
Date	Sep 8, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i3 Checkmk Enterprise (CEE), Checkmk MSP (CME)

The internal used variable names were invalid for filesystem growth graphs (used dashes which does not seem to work)

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