Fix tests after updates to var names.

[distortedsignal]

JupyterHub updated their wording from (black|white)list to (blocked|allowed)_users, and the code was not handling it well. This PR should fix those failures.

I'm disappointed in JupyterHub that they decided to break backward compatibility in this way on a minor version release. I think that the intent behind the change is good, but the actual change is clumsy and haphazard.

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Developer's Certificate of Origin 1.1

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(b) The contribution is based upon previous work that, to the best of my knowledge, is covered under an appropriate open source license and I have the right under that license to submit that work with modifications, whether created in whole or in part by me, under the same open source license (unless I am permitted to submit under a different license), as indicated in the file; or

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Signed-off-by: Thomas Kelley [email protected]