Ticket 49137 - Add sasl plain tests, lib389 support
    
    Bug Description:  We need to test that SASL plain works in DS.
    
    Fix Description:  To do this, we need to fix sasl in lib389, we
    correct openConnection to use more than just gssapi, we fix
    start tls to work over multiple connections.
    
    https://pagure.io/389-ds-base/issue/49137
    
    Author: wibrown
    
    Review by: mreynolds (THanks!)