Issue 51233 - ds-replcheck crashes in offline mode
Bug Description: When processing all the DN's found in the Master LDIF
it is possible that the LDIF is not in the expected
order and ldifsearch fails (crashing the tool).
Fix Description: If ldifsearch does not find an entry, start from the
beginning of the LDIF and try again.
relates: https://pagure.io/389-ds-base/issue/51233
Reviewed by: spichugi(Thanks!)