Issue 34086: Move the factory code outside buildbot

Realistically a P3 for now

To make our buildbot factories more easily modifiable, we want to move as 
much code as possible to the code checkout itself. This will allow a script 
to be tested and modified more easily without restarting the master.

A while ago I had a prototype, but never had time to actually implement it for real.

I also doubt that I will have time to work on this this quarter.  Unassigning. 

This bug is up for grab.

This issue has not been modified in over a year.  If it is no longer relevant, please close.  But if you still care about this issue, so do we!  To avoid it being closed automatically in 2 weeks, please provide any additional details you have, including verifying that it still reproduces, the priority level, and any labels applied.

This bug has had no activity since the cleanup warning was made several weeks ago.  Archiving.

Please re-open if this is still an issue.