Trac Ticket #443 - Deleting attribute present in
        nsslapd-allowed-to-delete-attrs returns Operations error
    
    https://fedorahosted.org/389/ticket/443
    
    Bug Description: Even if setting a config parameter to nsslapd-
    allowed-to-delete-attrs, the value failed to delete if the type
    was on|off or integer.
    
    Fix Description: Store all the initial config param values in
    ConfigList.  If the attribute value is deleted, reset the initial
    value.