EOLed by upstream, doesn't receive any patches anymore, so let's drop
it.
Currently depends on #211886 which bumps the latest compatible ZFS
version to 6.1.
Also, clean up some old aliases.
The problem behind this is that the hardened patchset[1]. Quite recently
this led to a weird problem when Linux 5.12 was dropped (and thus had to
be removed from `nixpkgs`), there were no patches for 5.13, so
`linuxPackages_hardened_latest` had to be downgraded to 5.10 as base[2]
which may be rather unintuitive and unexpected.
To avoid these kind of "silent downgrades" in the future, it makes sense
to drop the attribute entirely. If somebody wants to use a hardened
kernel, it's better to explicitly pin it using the newly introduced
versioned attributes, e.g. `linuxPackages_4_14_hardened`.
[1] https://github.com/anthraxx/linux-hardened/
[2] https://github.com/NixOS/nixpkgs/pull/133587
The test doesn't evaluate since #125469 because Linux 5.11 got removed
as it's EOL.
As this fixes the evaluation of the test and it only removes a
declaration that was apparently forgotten, I figured that a push to
unbreak the test is fine.
Pass the args from kernel-generic.nix's top-level to the individual
tests. Makes `nix-build -A nixosTests.kernel-generic.<attr>` and
`nix-build nixos/tests/kernel-generic.nix -A <attr>` work as expected.
