Handle MemcachedCache -> PyMemcacheCache in apply_django_settings.

Review Request #12475 — Created July 17, 2022 and submitted — Latest diff uploaded

Information

Djblets
release-3.x

Reviewers

We made some changes inside Review Board to upgrade the CACHES setting
during upgrade, but that neglected to handle the case where the cache
was set in siteconfig. We already had some migration logic for previous
renames, so I've just extended that to also include this new rename.

  • Set up a reproduction case where we had outdated CACHES configuration
    in siteconfig. Saw that I could run everything and that the
    configuration that got applied to django.conf.settings used
    PyMemcacheCache. Verified that the configuration UI inside Review
    Board's admin showed the correct setting as well (was previously
    showing as "custom" when un-migrated).
  • Ran unit tests.

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