[Merge] ~ken-vandine/ubuntu-seeds/+git/ubuntu:eoan into ~ubuntu-core-dev/ubuntu-seeds/+git/ubuntu:eoan

[Tobias Koch]

I think this functionality in livecd-rootfs has not been SRUed back into xenial. I see it is in bionic. See live-build/functions in _snap_preseed (Look for "Determine if and what core snap is needed").
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https://code.launchpad.net/~ken-vandine/ubuntu-seeds/+git/ubuntu/+merge/370062
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