5bbea52 MEMBEROF: Implement the modify operation for ghost users

Authored and Committed by jhrozek 7 years ago
    MEMBEROF: Implement the modify operation for ghost users
    
    Similar to the add and delete operation, we also need to propagate the
    changes of the ghost user attribute to the parent groups so that if a
    nested group updates memberships, its parents also get the membership
    updated.
    
        
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