[6.15.z] Fix expected user name

[Satellite-QE]

Cherrypick of PR: #17161

Problem Statement

Test tests/foreman/ui/test_ldap_authentication.py::test_positive_add_katello_role fails with the following error message:

AssertionError: assert 'givenName sn' in 'Foreman User'

The reason is that instead of comparing expected value of the name field, verbatim names of those fields are used instead - givenName and sn of course aren't names of the user but names of the fields where that info is stored.

Solution

Use user shown name config field that is meant specifically for this, it specifies the expected display name of the user in config file.
This is consistent with changes in other similar tests as per #16382

Related Issues

Similar failures fixed in #16382

[Satellite-QE]

trigger: test-robottelo
pytest: tests/foreman/ui/test_ldap_authentication.py::test_positive_add_katello_role

[Satellite-QE]

PRT Result

Build Number: 9668
Build Status: SUCCESS
PRT Comment: pytest tests/foreman/ui/test_ldap_authentication.py::test_positive_add_katello_role --external-logging
Test Result : ================== 2 passed, 45 warnings in 924.47s (0:15:24) ==================