Make the replication compatible with OpenLDAP when ApacheDS is a producer

Currently, we use a specific control to manage MODDN operations, in order to avoid the sending of potentially hundreds of entries to the consumer. OpenLDAP does not support this feature.

In the next version, we should add a way to dectect that the consumer does not support this feature, and then switch back to the standard RFC 4533 replication mode.

This can be done by sending a specific control attached to the first LDAP replication request.