Werk #8356: Fix showing new metric graphs for filesystems containing a dot in their name

Component	Metrics system
Title	Fix showing new metric graphs for filesystems containing a dot in their name
Date	Nov 27, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i4 Checkmk Pro, Checkmk Ultimate MT

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