Fix for issue 3701 (The Setup is not managing properly the backends when the replication involves multiple base-dn)

With this fix the setup tries to use the same backend configuration of the servers that is replicating withFix for issue 3701 (The Setup is not managing properly the backends when the replication involves multiple base-dn)

With this fix the setup tries to use the same backend configuration of the servers that is replicating with.  So, if all the base DNs are on the same backend of the remote server, all the base DNs will be on the same backend of the server that is being setup.  If the base DNs are in different backends, the setup will create a backend for each base DN.