Werk #5733: Fixed bulk deletion of users with special characters in their ID

Component	Setup
Title	Fixed bulk deletion of users with special characters in their ID
Date	Feb 16, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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