[Merge] ~rbalint/livecd-rootfs:wsl into livecd-rootfs:ubuntu/master

[Robert C Jennings]

> Adding the manifest will show that you are pre-seeding core and lxd which add
> ~150MB to the compressed tar.  Until you can have snapd run to preseed snaps
> these are a waste of space and I would like to seem them removed.

I'm okay with the rationale that this is eoan-only and will help MS developers make progress.  Thanks for the explanation in IRC.
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https://code.launchpad.net/~rbalint/livecd-rootfs/+git/livecd-rootfs/+merge/367293
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