Ticket 2 - allow configuration of the portal
    
    Bug Description: Many sites will want to allow customising
    their portal experience by changing what attributes "can" and
    "can not" be edited, what is displayed, and of course the
    basedn of the site.
    
    Fix Description: Allow limited configuration of the instance
    via a config.ini file.
    
    https://pagure.io/389-ds-portal/issue/2
    
    Author: William Brown <william@blackhats.net.au>
    
    Review by: mreynolds (Thanks!)