Werk #3760: Cluster nodes can not be nodes of their own anymore

Component	Setup
Title	Cluster nodes can not be nodes of their own anymore
Date	Aug 5, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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