Fix missing 'apiVersion' in example templates

When the template.apiVersion is missing, the runtime.Object parser
can't figure out the Template object properly and thus the
TemplateProcessor produces a Config with null items.

Bug 1146024 - https://bugzilla.redhat.com/show_bug.cgi?id=1146024

All of the below should produce Config with non-null items:
```
openshift kube process -c ./examples/guestbook/template.json
openshift kube process -c ./api/examples/template.json
openshift kube process -c ./examples/simple-ruby-app/template/template.json
```

@mfojtik @bparees review pls

TODO: Fix the k8s `DecodeInto()` to handle unknown/empty "apiVersion" and try to use `latest.Version` instead. /cc @smarterclayton