Add nixos test for radicale

[aneeshusa]

Motivation for this change

I attempted to run radicale on Python 3 and ran into some errors along the way. This PR has a few changes in separated commits:

• a new NixOS test for radicale
• fixes to enable building radicale on Python 3
• fixes for bcrypt
• package update for passlib

cc radicale maintainers @pSub @edwtjo

Things done

• Tested using sandboxing
  (nix.useSandbox on NixOS,
  or option build-use-sandbox in nix.conf
  on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • Linux
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

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[mention-bot]

@aneeshusa, thanks for your PR! By analyzing the history of the files in this pull request, we identified @FRidh to be a potential reviewer.

[FRidh]

cryptography is updated so likely this is a mass rebuild

[aneeshusa]

cryptography doesn't need to be updated for radicale so I'll split that into a different PR.

[thufschmitt]

You probably should keep them for python2 in order not to break existing configs

[aneeshusa]

Done.

[thufschmitt]

Is there a reason why you moved it from buildInputs to propagatedBuildInputs ?

[grahamc]

bump @aneeshusa

[aneeshusa]

Yeah, bcrypt needs to be propagated for modules that depend on passlib to be able to use the bcrypt backend. I added this to the commit message.

[aneeshusa]

Thanks for taking a look, I've addressed review comments and re-tested this. I also added a commit adding myself as a maintainer.

[aneeshusa]

I've rebased this on master. I'd like to have this merged before Radicale 2.0 comes out of beta if someone wants to take a look!