Guestbook Example Broken

[nathanmartz]

It looks like the guestbook example is broken when using the kube-libsonnet at head. It looks like the breakage occurred in early April of last year. The issue appears to be that Service requires containers to have named ports, per this bit of logic:

name: service.target_pod.spec.containers[0].ports[0].name,

But the sample doesn't provide a name for the port.