Ticket 47761 - Return all attributes in rootdse without explicit request
    
    Bug Description:  a search for the rootdse: -s base -b ""
    			only returns the user attributes not the
    			operational attributes like "supportedControl"
    		 This is correct inLDAPv3, and behaviour was introduced
    			with fix for #47634, but for backward compatibility
    			the old behaviour should be configurable
    
    Fix Description:   Introduce a multivalued attribute to specify the
    			attribites which should be returned without
    			specific request
    
    https://fedorahosted.org/389/ticket/47634
    
    Reviewed by: richm, thanks