Review usage of deprecated field in DaemonSet parent_of_pod? method

[douglas]

Improvement Analysis / Request

During the work on https://github.com/Shopify/kubernetes-deploy/pull/598 to support Kubernetes 1.16 (and move from extensions/v1beta1, we discovered that the templateGeneration field was removed in DaemonSet v1 and was deprecated in this PR:

https://github.com/kubernetes/kubernetes/pull/49454 Related issue: https://github.com/kubernetes/kubernetes/issues/49336

In order to ship Kubernetes 1.16 support sooner we decided to use deprecated.daemonset.template.generation as templateGeneration field was removed in DaemonSet apps/v1 API.

Suggested approach

After https://github.com/Shopify/kubernetes-deploy/pull/598 ships we need to review this code to check if there is a way to avoid the usage of a deprecated field.

DaemonSetSpec v1

DaemonSetSpec v1beta1