Ticket 49290 - unindexed range searches don't provide notes=U
    
    Bug Description:  An unindexed range search would not issue notes=U
    in the access log.
    
    Fix Description:  When an unindexed range search is found, add
    the operation note that the query is unindexed.
    
    https://pagure.io/389-ds-base/issue/49290
    
    Author: wibrown
    
    Review by: tbordaz (Thanks!)