Instances without a public IP cause Sugar to connect to localhost

```
$ sugar xx@xx
Connecting to i-xxxxxxxx (the only xxxxxxxxxxxxxx instance)
The authenticity of host ' (::1)' can't be established.
RSA key fingerprint is xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '' (RSA) to the list of known hosts.
Password:
```
