Ideally the ldapadd command posted in Comment 14 should be used prior running the upgrade. Could someone with more RPM skills add such a auto-magic command if there is an existent setup with cn=config without these modules being loaded? But anyhow something could go wrong in between. That's why I already recommended in Comment 12 to invoke this command *before* the upgrade: slapcat -b cn=config -l /var/lib/slapd-config-<timestamp>.ldif