Werk #4667: Cluster edit page: Removed useless "network scan" properties

Component	Setup
Title	Cluster edit page: Removed useless "network scan" properties
Date	May 9, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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