Issue 49761 - Fix replication test suite issues
    
    Description - the issues:
    cleanallruv - add 'certify' to the abort tasks certify and adjust a timeout;
    encryption_cl5 - add the encryption attributes to the schema
    (we had used extensibleObject before but now we use nsChangelogConfig);
    tombstone - fix how Tombstone(DSLdapObject) handles the searches.
    
    https://pagure.io/389-ds-base/issue/49761
    
    Reviewed by: vashirov, mreynolds (Thanks!)