Plan to establish more reduced set of Localizer builds

• 2 Branches
  • "stable" l10n nightly users, on existing released branches
  • "adventurous" l10n nightly users, on tip of mozilla-central, as well as anyone on mozilla-2.0 before the release of FF4.0.

• Specify who needs nightlies
  • Provide list to RelEng
  • Show the impact (of extra load on shared infrastructure of generating 80 locales+updates per 6 OS per branch)
• Who is on "old" nightlies (Fx 3.5) and why?
  • Migrate with assumption that they are stuck
  • Assess Impact
    • Which l10n people are stuck on what versions? any reason to not move people from old nightlies to new nightlies?)
• enable Mozilla-20 branch
  • How to migrate other stable users? (to most recent stable release (i.e. FF3.5.x -> ff3.6.x)

RelEng Plan to Implement

1. Generate custom updates to move mozilla-191 nightly l10n users up to mozilla-192 nightlies, and then stop generating mozilla-191 nightly builds and updates
2. Generate custom updates to move mozilla-central nightly l10n users up to mozilla-20 nightlies, then stop generating mozilla-central l10n nightly builds and updates.
3. Once Firefox4.0 ships, update the existing mozilla-192 l10n nightly users to mozilla-2.0
4. Once Firefox4.0 ships, update the existing mozilla-20 l10n nightly users to mozilla-central.