Comment 3 for bug 1411574

Correction - comment #2 - "generate-image" not "generate-images". Also the image id (-i <id>) argument is required, so the the user needs to know how to create/list created images via the cloud API in order to use it.

A nice article I found with detailed instructions: http://blog.felipe-alfaro.com/2014/04/29/bootstraping-juju-on-top-of-an-openstack-private-cloud/

In summary, it does not seem as easy as I thought originally to automate this process with juju-quickstart.
It's still useful though, but likely lower priority.