2fa7626 coreos: change ordering of AWS regions

Authored and Committed by jlebon 4 years ago
    coreos: change ordering of AWS regions
    
    Put US, EU, and AP regions first since those are the most popular and
    cheapest. Then put everything else. Within those buckets, sort them in
    alphabetical order, so e.g. `us-east-1` is before `us-east-2`. This
    roughly matches the way Fedora Cloud also lists its AMIs.