Comment 0 for bug 1037727

currently, the ec2 datasource has some code that selects the mirror location by looking at the availability-zone.
I think this is generally a pretty good idea. I'd like to extend that to other datasources, and not limit to ".ec2.archive.ubuntu.com".

The goal would be to basically check for a mirror at:
  <availability-zone>[.<cloud>][dns-subdomain]

dns subdomain would default to '.cloud.archive.ubuntu.com'.

if the datasource provided the 'cloud' value, we'd use that, but otherwise just use availability-zone.

This would fit in with what we're currently doing on ec2, but would extend to others.
I'd just treat the "cc-direction-[0-9]" availability-zones specially, to know that this is an ec2 one. Then basically append ".ec2" in that case.