Werk #6066: 389directory: Use "member" as group member attribute by default

Component	User interface
Title	389directory: Use "member" as group member attribute by default
Date	May 14, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0b4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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