Code review comment for ~paul-martin-1/cirros:paulm/fixes

This was really well done.
Thank you for your work and your patience.

I put a build of at
 http://download.cirros-cloud.net/contrib/nowster/20190515/

with essentially what i just landed here.

I've rebased this branch on top of the 566b84c58 (grab-kernels: support newer kernel packages.)
and then fast-forwarded.