Description of problem:
Working in a case where the usergroup feature was not working as expected, instead the ldapfluff method "user_list" bring the uid, was returning the first and last name. For example, instead of "waldirio" was returning "waldirio pinheiro", that said, the match with the user account was failing and not working properly.

Version-Release number of selected component (if applicable):
6.6

How reproducible:
100% on the customer environment. They have openldap implemented.

Steps to Reproduce:
1. foreman-rake console
2. creating the connection and then proceeding with the method call
3. conn.user_list('satellite_grp')

Actual results:
=> ["waldirio pinheiro"]

Expected results:
=> ["waldirio"]

Additional info:

QE Tracker for https://issues.redhat.com/browse/SAT-18316
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1882535