Determine canonical list of (run-time) dependencies for Kubernetes

[jberkus]

We need a canonical list of official dependencies for Kubernetes, something we don't currently have. This should appear both in the docs and in the release notes.

For example, this section of the release notes is currently a grab-bag:

https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.10.md#external-dependencies

Some of those things should be listed, some shouldn't, and there's certainly stuff that ought to be listed there that isn't.

@jdumars @bgrant0607 @nickchase @zacharysarah

[jberkus]

/sig architecture
/sig release
/sig documentation

[jberkus]

/milestone v1.12
/kind documentation

[fejta-bot]

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[nikhita]

/remove-lifecycle stale

[spiffxp]

/sig cluster-lifecycle
kubeadm does some amount of node-level dependency verifying, perhaps their mechanism is a place to start

Also ref: kubernetes/sig-release#400 for the release team to at least have some kind of documented process to follow in its checklist

[tpepper]

@marpaia fyi