[6.15.z] virt-who config upgrade duplicate config issue fix

[Satellite-QE]

Cherrypick of PR: #14378

when the virt-who upgrade tests failed for some issues, delete virt-who config will failed, then rerun the upgrade testing, it will create another virt-who config in other org, but when list or check info the config, it will list the first virt-who config.

Use auto name to fix it.
Test Case: PASS

(robottelo_vv_615) [root@dell-per740-68-vm-05 robottelo]# pytest ./tests/upgrades/test_virtwho.py  -m pre_upgrade --disable-pytest-warnings -q
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1 passed, 1 deselected, 20 warnings in 188.91s (0:03:08)
(robottelo_vv_615) [root@dell-per740-68-vm-05 robottelo]# pytest ./tests/upgrades/test_virtwho.py  -m post_upgrade --disable-pytest-warnings -q
.                                                                                                                                                                                                                                      [100%]
1 passed, 1 deselected, 12 warnings in 136.32s (0:02:16)