Public bug reported:

[Impact]

 * livecd-rootfs when building classic images with snaps preseeded
doesn't perform any first-boot tasks during image building. It means
fist boot is computationally intensive. In groovy, livecd-rootfs gained
ability to precompute snap seeding, apparmor profiles making first boot
snap seeding a lot faster. Backport the goodies.

[Test Case]

 * Perform stock build of ubuntu-cpc lxd or qcow cloud image

 * Boot and observe they complete boot, and perfrom snap seeding very
quickly (i.e. less than a couple of seconds)

[Regression Potential]

 * Images might fail to build, or be missbuilt. However, these changes
have been tested on groovy with the same snapd across all SKUs. Thus
only groovy-vs-focal incompatibilities may arise.

** Affects: livecd-rootfs (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: livecd-rootfs (Ubuntu Focal)
     Importance: Undecided
         Status: Confirmed

** Affects: livecd-rootfs (Ubuntu Groovy)
     Importance: Undecided
         Status: Fix Released

** Also affects: livecd-rootfs (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: livecd-rootfs (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Changed in: livecd-rootfs (Ubuntu Groovy)
       Status: New => Fix Released

** Changed in: livecd-rootfs (Ubuntu Focal)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1896755

Title:
  Backport snap-preseed work from groovy to focal

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