Comment 2 for bug 1733354

The informative message from 2.2 should be back, as a result of fixing https://bugs.launchpad.net/juju/+bug/1732564.

We do not hard code instance types. We hard code minimum CPU/memory.

The problem is that the instance type is available in the region, but only in some availability zones, and apparently we're not retrying in all the zones for this error scenario.