Release interview blog post for 1.16 (kubernetes#17963)

* Release interview blog post for 1.16

Part 3, after

* https://kubernetes.io/blog/2018/07/16/how-the-sausage-is-made-the-kubernetes-1.11-release-interview-from-the-kubernetes-podcast/
* https://kubernetes.io/blog/2019/05/13/cat-shirts-and-groundhog-day-the-kubernetes-1.14-release-interview/

* Update 2019-12-05-kubernetes-1-16-release-interview.md

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