[Merge] ~simpoir/livecd-rootfs/+git/livecd-rootfs:buildd_unpin_backports into livecd-rootfs:ubuntu/master

[Simon Poirier]

Simon Poirier has proposed merging ~simpoir/livecd-rootfs/+git/livecd-rootfs:buildd_unpin_backports into livecd-rootfs:ubuntu/master.

Commit message:
Unpin backports priority for buildd images.

There was a time historically where Launchpad buildd might have relied
on that behaviour, but this shouldn't be the case anymore as it sets
priority manually when building backports.
Meanwhile any other builds using buildd images (e.g. snapcraft)
shouldn't default to backports unless required. (lp: #2009871)
Refs:
- [1] https://git.launchpad.net/launchpad-buildd/commit?id=c2ebcb6752

Requested reviews:
  Canonical Foundations Team (canonical-foundations)
Related bugs:
  Bug #2009871 in cloud-images: "snapcraft images contain backports repo by default"
  https://bugs.launchpad.net/cloud-images/+bug/2009871

For more details, see:
https://code.launchpad.net/~simpoir/livecd-rootfs/+git/livecd-rootfs/+merge/460194
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