On Fedora 22 OpenLDAP uses the mdb Engine as default. But if i want to setup webmin for use with LDAP webmin always want to write the config for the bdb Engine. Error message is:
No LDIF-format config file found for olcDatabase={2}bdb,cn=config
OpenLDAP 2.4.40
Perl 5.20.3-328
Hope this is usefull...
Thanks - this will be fixed in the next Webmin release.