Add 2nd url to public_info for redundancy

Public_info will now try http://whoami.rackops.org/api first and if this fails it will use http://dazzlepod.com/ip/me.json. There is a difference in the JSON returned for remote_ip from dazzlepod so logic added to deal with this. 
@fernandohonig Shouldn't this be a warning vs. a debug level? It almost seems like it would be worth failing the converge with a `fail` here, just to kill the chef-run when public_info fails. Or maybe we should retry some number of times, with a sleep inbetween.