Werk #12382: Discovery: Fix counting ignored clustered services

Component	Checks & agents
Title	Discovery: Fix counting ignored clustered services
Date	Mar 31, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0p23 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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