Add new ipaddresses hash for issue #343

- [x] Joyent, OpenStack, Rackspace
- [x] AWS (done in another PR)
- [x] Provisioner Automator
- [x] Server-side support
- [x] UI changes to new addresses
- [x] Cluster templates
- [x] Docs updated

Fixes #343 
It would be to return unmodifiable map here.