[Merge] ~codyshepherd/livecd-rootfs/+git/livecd-rootfs:tarball-transform into livecd-rootfs:ubuntu/xenial

[Cody Shepherd]

Cody Shepherd has proposed merging ~codyshepherd/livecd-rootfs/+git/livecd-rootfs:tarball-transform into livecd-rootfs:ubuntu/xenial.

Commit message:
Bring tarball and rootfs hooks in line with bionic+, and allow for ext4 image format to be built without breaking tarballs. LP: #1863024

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

For more details, see:
https://code.launchpad.net/~codyshepherd/livecd-rootfs/+git/livecd-rootfs/+merge/392066

This is a fix for the verification failure of changes merged to fix LP: #1863024
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~codyshepherd/livecd-rootfs/+git/livecd-rootfs:tarball-transform into livecd-rootfs:ubuntu/xenial.
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