Locally-reproducing package tests

[Evan Dandrea]

Hi,

In building the scalable replacement for package tests, the CI team
was careful to ensure that local-reproducibility was maintained. If
you would like to quickly iterate on tests, or closely mirror the
production environment when debugging, we have provided some
instructions:

https://wiki.ubuntu.com/ProposedMigration#Reproducing_failures

Please note that while this will block much unwarranted traffic, it
does not completely replicate the production firewall rules. Only an
upload to the archive will be able to tell you with certainty whether
your test is free from attempts to access the Internet.

Thanks