Werk #5089: citrix_xenapp.ps1: Refactored; now uses powershell commands for Citrix environment instead of WMI objects which caused runtime errors

Component	Checks & agents
Title	citrix_xenapp.ps1: Refactored; now uses powershell commands for Citrix environment instead of WMI objects which caused runtime errors
Date	Aug 7, 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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