Adding a new Geo:
* create health check for each host in geo
* create new weighted record set for each host in geo
www-sfo: 10.0.0.1 weight: 10 setID: host1 health check: yes
www-sfo: 10.0.0.2 weight: 10 setID: host2 health check: yes
* create alias record with latency routing:
www: www-sfo region: sfo evaluate target health: yes