Ticket 50243 - refint modrdn stress test
    
    Bug Description: It was reported that modrdn of an ou which
    contained many items could break refint in some cases.
    
    Fix Description: Add a stress test to try to reproduce the issue
    
    https://pagure.io/389-ds-base/issue/50243
    
    Author: William Brown <william@blackhats.net.au>
    
    Review by: spichugi (Thanks)