Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1437578

Description of problem:
Via foreman-rake when retrieving information from "Domain Users" the value is empty although when retrieving information from one new group just created, the retrieved value is correct.

Version-Release number of selected component (if applicable):
6.2.8

How reproducible:
100%

Steps to Reproduce:
1. Login via foreman-rake console
2. source_now = AuthSourceLdap.find_by_id(3) # on my case, my connection is #3
3. conn = source_now.ldap_con
4. conn.valid_group?('Domain Users') # result here is true
5. conn.user_list('Domain Users') # the result here is empty (should see 4 users)

Actual results:
Should be possible see all members of "Domain Users", instead we see empty value.

Expected results:
See all users memberof "Domain Users"

Additional info: