[Devstackpy] download optimization idea

[Doug Hellmann <doug.hellmann@xxxxxxxxxxxxx>]

As I sit waiting for oneiric-server-cloudimg-amd64.tar.gz to download, I had an idea to start the big image downloads in a thread earlier in the process. Maybe in the warmup phase the glance installer could start a thread, and then it could join the thread later. We would need to be careful with error logging to make sure it shows up at the point where something tries to use the file.

What do you think of the idea?

Doug