Ticket #214 - Adding Replication agreement should complain if required nsds5ReplicaCredentials not supplied
    
    Bug Description:  the server allows you to add replication agreements for SIMPLE & SASL/DIGEST-MD5 without
                      supplying a bind DN or password.  The console enforces this, but not through the command line.
    
    Fix Description:  If the authentication method is not SSL Client Auth or SASL/GSSAPI, then make sure a
                      bind DN and password are supplied.
    
    https://fedorahosted.org/389/ticket/214
    
    Reviewed by: Noriko!