[Bug 1882374] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for livecd-rootfs has
completed successfully and the package is now being released to
-updates.  Subsequently, the Ubuntu Stable Release Updates Team is being
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the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1882374

Title:
  Support inclusion of snap from specific track/channel/branch

Status in cloud-images:
  Triaged
Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Focal:
  Fix Released

Bug description:
  [Impact]

   * Can only seed snaps from latest track, yet there is desire to
  support "LTS" tracks.

   * Add support for snap:$SNAP=$TRACK/$RISK/$BRANCH syntax in seeds,
  e.g.

  ```
  * snap:lxd=4.0/stable/ubuntu-20.10
  ```

  [Test Case]

   * Use full-channel specification in the seed and test build ubuntu-
  server, subproject live build.

  [Regression Potential]

   * Backwards compatible with existing seeds.
   * New code only used when full channel is specified in the seed.

  [Other Info]
   
   * Original bug report

  We have a bit of a problem right now with LXD in Ubuntu 20.04.

  Users upgrading from 18.04 to 20.04 or those installing LXD through
  the deb shim, will correctly detect that they are on a LTS and auto-
  select a LTS branch of LXD (defaults to 4.0).

  That's however not the case for the images we publish which all
  default to "latest" and so currently pull in LXD 4.1 and soon 4.2.

  This isn't good as the behavior we're aiming for is that LTS users
  should get an LTS track of LXD (4.0) and non-LTS users should get the
  latest track.

  To fix this, we need to be able to specify a track/channel/branch
  alongside the snap we want to seed and have livecd-rootfs pull that.

  For LXD that would mean "lxd 4.0/stable/ubuntu-20.04" in focal and
  "lxd latest/stable/ubuntu-20.10" on groovy. The exact syntax doesn't
  matter and it's probably fair to assume that the ubuntu branch will
  exist so won't need specifying.

  We would like this issue sorted in time for Ubuntu 20.04.1 so we have
  a good consistent story for those upgrading and those deploying new
  systems at that time.

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