NEW: Source PPA grouping for bileto tickets during proposed-migration

[Robert Park]

Hi all,

On Friday we went live with the actually-working version of source PPA
grouping in proposed-migration.

What this means:

If you have a bileto ticket with 2 or more packages in it, and this
gets published, you should now no longer see some of your packages
migrate to Release pocket while some stay stuck behind in Proposed
pocket. Now nothing will migrate to Release pocket until the entire
PPA is ready to migrate to release pocket.

If you're looking in update_excuses, you'll now start seeing "Blocking
because foo-package from the same PPA
~ci-train-ppa-service/+archive/ubuntu/1234 is invalid"

Enjoy!

-- 
robru