With this each MP can have any of these lines, as appropriate:
Prereq-archive: ppa:someteam/someppa
Prereq-archive: deb https://user:<email address hidden>/someteam/privateppa/ubuntu RELEASE main
Prereq-archive-keys: 1A2B3C4D
These will be added *on top* of the extra_repositories and
extra_repository_keys values passed in the job itself.
NOTE: lp- jobs now require your monitor slaves to have launchpad
credentials configured (run credentials-2-launchpad and
credentials-3-launchpad-plugin on them and add the "launchpad" label).
All /usr/share/deboostrap/scripts/$ubuntu_release scripts are a link to
gutsy. Depending on what the slave system is, it might not know yet
about a newly opened Ubuntu release. So do the link ourselves. This is
naive, but should work in most use cases of jenkaas-jobs.