upgrade control plane before compute

[cgwalters]

We need to upgrade masters before workers when doing OS updates.

This is a messy topic because so far we've intentionally conflated "config change" and "OS update". Maybe simplest is to just have the node controller just prioritize master (or we add a generic priority integer or something). But basically I think simplest is to do this in the node controller.

Another approach would be for the operator to control the pools - set an equivalent of the Paused field (we wouldn't want to acutally use Paused since that's for admins to use).

[runcom]

thanks for filing this out Colin

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