Ticket 48751 - Improve lib389 ldapi support
    
    Bug Description:  Previously lib389 didn't support ldapi. This limited some
    connection options to always require a username or password, when autobind
    is an option in some cases.
    
    Fix Description:  This improves the support to allow ldapi, simple binds over
    ldapi, and also to allow autobinding if the situation allows.
    
    https://fedorahosted.org/389/ticket/48751
    
    Author: wibrown
    
    Review by: mreynolds (Thanks!)