Werk #4509: Removed now useless "parents" attribute from "New/Edit cluster dialog"

Component	Setup
Title	Removed now useless "parents" attribute from "New/Edit cluster dialog"
Date	Mar 21, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.4.0b4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Since the parents of cluster hosts are automatically determined in all situations now, we have removed this attribute from the GUI.

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