replication: augment setup_promote_replication method
    
    the method that sets up initial GSSAPI replication in DL1 was augmented so
    that the specified bind DN/bind password allows simple bind to remote master
    using STARTTLS. The CA certificate for the connection is also configurable.
    
    This facilitates the use of this method in DL0 where GSSAPI bind can not be
    used during DS bootstrap while DM credentials are available.
    
    https://fedorahosted.org/freeipa/ticket/6406
    
    Reviewed-By: Martin Basti <mbasti@redhat.com>