tests for go templates

[bergerx]

Currently, template development depends on developers. Kubernetes API has lots of fields optional and shows up only when there is a value is set. In many cases, they depend on some other fields' existence. We need to figure out a way to validate templates and also provide a wide range of test artifacts. With that, we can work on the template improvements just by getting a get -o yaml output from users.

We need to be able to test templates free from a cluster. And just by providing some basic information.

This will allow template development to be faster and easier without having to depend on developers' environments.