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!)

ldap/admin/src/scripts/ds-replcheck

@@ -637,6 +637,10 @@ def do_offline_report(opts, output_file=None):
     missing = False
     for dn in master_dns:
         mresult = ldif_search(MLDIF, dn)
+        if mresult['entry'] is None and mresult['conflict'] is None and not mresult['tombstone']:
+            # Try from the beginning
+            MLDIF.seek(0)
+            mresult = ldif_search(MLDIF, dn)
         rresult = ldif_search(RLDIF, dn)
 
         if dn in replica_dns: