Add new ipaddresses hash for issue #343

This is only a part of what is required for #343 to be completed.

- [x] Joyent, OpenStack, Rackspace
- [x] AWS (will add to AWS PR)
- [ ] Server-side support
- [x] UI changes to new addresses
- [x] Cluster templates
I believe ipaddr is stdlib, not a gem:
$ gem install ipaddr
ERROR:  Could not find a valid gem 'ipaddr' (>= 0) in any repository
ERROR:  Possible alternatives: baddr, hwaddr