test: Remove SELinux systemd-nologin workaround
test: Remove SELinux systemd-nologin workaround

So that we can see if this happens again, as requested in:

https://bugzilla.redhat.com/show_bug.cgi?id=1276601

Closes #3091
Closes #4846
Reviewed-by: Dominik Perpeet <f7830b2723a5db4fc185058b06cfab4b89a38da9@redhat.com>

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