Code review comment for ~goneri/cloud-init:build-on-freebsd

This looks like a reasonable set of changes to me; is there any good way for me to test it? (Perhaps in a container/public cloud?)

Also, do we need to open a bug for converting this script to Python 3 in preparation for dropping Python 2 support from cloud-init[0]?

[0] https://lists.launchpad.net/cloud-init/msg00170.html