Code review comment for lp:~vorlon/ubuntu-archive-tools/update-i386-whitelist

The PPA hack is icky, but given I filed the relevant LP bug, I understand why it's there. Might do with a comment referencing the bug and encouraging removal.

My only other comment (not a blocker, cause I'm not convinced we'll ever have another partial arch, but it seems more in the spirit of the feature?) is that it should probably be named update-arch-whitelist and take a '-a' argument that fills in all the bits in the source that currently hardcode i386.

Approved with or without those changes, though I think I'd strongly prefer the latter happen (it can default to i386 for now, given that's our only partial arch, if that makes it more palatable to you).