Fix a non-deterministic test bug

Test was relying on map order.
Remove instance.(Wait)DNSName

Because we don't need them, and I'm sick of seeing them.
Merge pull request #38 from axw/remove-instance-dnsname

Because we don't need them, and I'm sick of seeing them.

Also, drive-by fix for a non-deterministic test that fails with Go 1.3 beta 2.