With the changes done in revision 3695
(issue 1288 : replication should not create 10 threads for each replication domain)
the window mechanism from the Replication Server to the LDAP server is not working
anymore because the window ACK is sent as soon as the LDAP server has read the message from
the socket while it should be sent after replaying the operation.

This can cause out of memory problems and bad monitoring.

The fix is to move the response using WindowMessage from the ListenerThread
to the ReplayThread at the end of the message processing.