Filter out warnings caused by cryptography in rb-site.

Review Request #11360 — Created Jan. 7, 2021 and submitted — Latest diff uploaded

Information

Review Board
release-4.0.x

Reviewers

When running rb-site with any modern version of the cryptography
module, a warning will be shown about cryptography dropping Python 2
support. This wasn't caught by the PendingDeprecationWarning, as they
output it as a UserError. We now filter these out, which also catches
a few others that could come up (like pdfminer.six from Power Pack).

Ran rb-site on Python 2.7. Saw the warnings go away.

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