Code review comment for lp:~rockstar/launchpad/upgrade-job-2.0-changes

Hi there-

  This branch makes some changes to the branch upgrade structure and the way a
branch determines whether or not it needs to be upgraded. Most of the original
code was pre-2.0, and now that bzr 2.0 has been released, the formats are a
little more stable, and we won't need to be concerned too much about changing
formats anymore.

  Instead of saying X format needs to be upgraded to Y format, we can just
upgrade it and it'll go to the 2.0 format regardless of the original format (as
opposed to the potential downgrade of older bzr).

Cheers,
Paul