Code review comment for lp:~psivaa/charms/trusty/snappy-proposed-image-tester/renames-subs

This is identical to https://code.launchpad.net/~fginther/charms/trusty/snappy-proposed-image-tester/renames/+merge/260324 which has already landed except for some whitespace differences. I don't see any reason to also attempt to merge this. Apologies for not making the other MP obvious.