Code review comment for ~raharper/curtin:fix/curtainer-dont-wait-for-snap

> :-(
>
> https://bugs.launchpad.net/cloud-images/+bug/1796137

..:(╯°□°)╯彡┻━━┻

>
> This just works around containers that take too long to boot.

Yes. Yes it does.

> Perhaps maybe we move to using minimal image for this?

Already tried; out of the box, minimal does not work with
what we do in curtainer:

 - add-apt-repository is not present
 - unminimize performs the same long running snap stuff that you get in fat
   images
 - apt installing additional stuff (software-properties) in minimal isn not faster
   that just disabling the slow part of the fat image

This is the simplest fix that keeps curtainer working as it does without this
really long boot.