[Merge] ~rs2009/livecd-rootfs:remove-snap-preseed into livecd-rootfs:ubuntu/master

[Brian Murray]

Review: Disapprove

I'm going to commit something similar to this but comment these lines out and add a reference to the bug which has been filed about snapd. Thanks for the investigation and MP though.
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https://code.launchpad.net/~rs2009/livecd-rootfs/+git/livecd-rootfs/+merge/430492
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