Issue 49239 - Add a new CI test case
    
    Bug Description: ds-replcheck unreliable, showing false positives, showing missing tombstone entries
    in the report.
    
    Fix Description: Added a test case to check missing tombstone entries is not reported, also fixed
    py3 issue in ds-replcheck by explicitly adding bytes.
    
    Relates: https://pagure.io/389-ds-base/issue/49239
    
    Review by: vashirov, mreynolds (Thanks!)