Ticket 48820 - Proof of concept of orm style mapping of configs and objects
    
    Fix Description:  This changes the backend type and config to rely on the new
    _mapped_object types. These abstract and essentially create an orm, allowing
    us to easily derive and share common operations to our config types.
    
    backend.py with the Backends and Backend classes are an excellent example of this
    
    https://fedorahosted.org/389/ticket/48820
    
    Author: wibrown
    
    Review by: spichugi (Thanks!)