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

[Cody Shepherd]

That is the manifest diff for the xenial base manifest, not the bootable image, as we have no bootable image currently in production.

There is a buildd binary hook that explicitly removes policyrd-script-zg2, so I believe this is intended.

It's worth noting that there are two tarballs that are produced from a given buildd subproject build: a rootfs tarball and a lxd tarball. I believe the manifest in question here reflects what is in the rootfs tarball; it's unclear to me whether it also reflects the contents of the lxd tarball.

It's also worth noting that the base manifests for the bionic builds we have in production currently include grub as well -- here is the bionic base manifest from the same day: https://paste.ubuntu.com/p/M4QbnVj3x3/ . So, if we truly do not want those packages included in the base manifests, we would seem to have problems in more recent suites.
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https://code.launchpad.net/~codyshepherd/livecd-rootfs/+git/livecd-rootfs/+merge/392066
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