[Merge] ~xnox/livecd-rootfs:snap-preseed-with-channel into livecd-rootfs:ubuntu/master

[Dimitri John Ledkov]

Dimitri John Ledkov has proposed merging ~xnox/livecd-rootfs:snap-preseed-with-channel into livecd-rootfs:ubuntu/master.

Commit message:
snap_preseed: support channel specification with snap name

snap_name=track/risk/branch is a common specification that is accepted
by snap tooling. Which in the future, will make it easier to use snap
prepare-image instead of snap download.

Supporting such specification in the seedtext allows one to specify a
better default channel. For example, this will allow lxd to switch
from latest/stable/ubuntu-20.04 to 4.0/stable/ubuntu-20.04 as 4.0 is
the LTS track matching 20.04 support timeframe.

Also stop requiring to specify snap_name/classic for seeding classic
snaps. Instead, introspect the downloaded snap to see if it is classic
or not. This way snaps are correctly seeded by name, whether they are
classic or not.

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)

For more details, see:
https://code.launchpad.net/~xnox/livecd-rootfs/+git/livecd-rootfs/+merge/385064
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~xnox/livecd-rootfs:snap-preseed-with-channel into livecd-rootfs:ubuntu/master.
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