add zfsutils-linux to base Dockerfile

[jrwren]

possibly a fix for #2163 so that the snapshotter = "native" config workaround is not needed.

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[BenTheElder]

One problem with this is that the tools will not match the kernel module version.

I do not recommend using the ZFS snapshotter, I don't think it's well tested and I don't think we can support it well containerized.

[BenTheElder]

Thanks, and thank you for your help on #2987, but we'll merge #2989 to fix ZFS