Werk #12620: Add missing metric definitions for redis checks

Component	Checks & agents
Title	Add missing metric definitions for redis checks
Date	Apr 6, 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 2.0.0p2 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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