Code review comment for lp:~julian-edwards/maas/dup-boot-source-selections-bug-1360280

Right, coalescing migration added, care to take another look?

I have tested this reasonably thoroughly in the dev environment, I used this script to poke values in http://paste.ubuntu.com/8935209/ and the end result looked exactly right (see comments in that script).

Note that there's two migrations as you can't do data and schema changes in the same migration.