skip the last ATS test since that is not openid

[valeriupredoi]

CI Tests started failing again, we've seen this issue before - the returned HTTPS response does not contain a magic string (forgot what it was) so the xml loader fails to interpret it correctly, and barfs - apart from skipping the test, I don't know how to fix it proper (apart from, of course, asking DKRZ to add that missing gimmick in their site source, which is nye on impossible)