Remove no-op constructors.

[hausdorff]

Stuff like containerPort.new() is a no-op. Consider just omitting this.

[chuckha]

this is not the case with k.extensions.v1beta1.deployment.new() because that yields:

apiVersion: extensions/v1beta1
kind: Deployment

Is there some difference between the two?

[hausdorff]

Yes, we want to remove only the no-op constructors. Top-level API objects set kind and apiVersion.

[hausdorff]

Actually, we need these right now, because we need the zero value on the lhs for the mixins to work. For example {} + {f+: 3} works, but {f+: 3} does not.