Ticket 48272 - ADDN Sytle prebind plugin
Fix Description: This plugin allows a unique entry that matches some filter
to bind with "user1" -> "uid=user1,ou=People,dc=example,dc=com".
For the user to bind:
* Only a single entry may be mapped from the filter, else it is considered a failure.
* The entry must belong under a specific suffix
* The user@domain.com maps the domain to a subconfig which maps to a suffix
to search underneath.
https://fedorahosted.org/389/ticket/48272
Author: wibrown
Review by: mreynolds, nhosoi (thank you both!)