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!)