Werk #10098: Fix performance issue for sites with a lot of piggyback hosts

Component	Setup
Title	Fix performance issue for sites with a lot of piggyback hosts
Date	Sep 19, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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