Issue 49946 - Add a new CI test case
    
    Bug Description: Upgrade of 389-ds-base could remove replication agreements.
    
    Fix Description: Added a test case to check if agreement starts with "cn=->..." then
    after upgrade does it get removed.
    
    Relates: https://pagure.io/389-ds-base/issue/49946
    
    Review by: mhonek