Modify the default attributes shown in user-find to match the UI design.
    
    This change means the UI can stop using the --all option and have to
    retrieve significantly less information from the server. It also
    speeds up user-find as it doesn't have to calculate membership.
    
    This adds a new baseclass parameter, search_display_attributes, which
    can provide a separate list from default_attributes just for find
    commands.
    
    The UI will need to be changed to switch from using cn to using
    givenname and sn.
    
    ticket 1136