Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1318629
++ This bug was initially created as a clone of Bug #1318325 ++

Description of problem:
auth_source_ldaps have 'groups_base' attribute, value of which is not returned by any of POST/GET/PUT request in sat6.2.

Version-Release number of selected component (if applicable):
Satellite 6.2.0 Compose 3

How reproducible:
100%

Steps to Reproduce:
1. Issue HTTP POST request to https://sat.example.com/api/v2/auth_source_ldaps with 'groups_base' attribute set to some value (e.g. 'CN=foobargroup,DC=fortellolabs,DC=org').
2. Capture the response. Examine the JSON payload and discover that the "groups_base" attribute is not mentioned.
3. Issue HTTP GET and HTTP PUT requests to previously created auth_source_ldap. Check the "groups_base" attribute presence.

Actual results:
'groups_base' attribute is absent in GET/POST/PUT responses.

Expected results:
'groups_base' attribute is present and has correct value.

Additional info:
Similar to #1318325