Werk #11910: Add warn/crit metrics for percentage usage of filesystems

Component	Checks & agents
Title	Add warn/crit metrics for percentage usage of filesystems
Date	Jan 11, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0b4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Levels where only shown for absolute size. This has been fixed.

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