Deploy component-health services

[aaronlevy]

ref: #64

The /componentstatus has some hard-coded expectations which we don't necessarily follow. We should provide an alternative way for easily inspecting cluster health.

One option discussed is deploying cluster-health services which can then be more consistently queried by external tools.

Something like:

Controller-manager and scheduler health can be implemented as normal services

etcd (I believe) would need to be implemented as a selector-less service (and populate the endpoints with known etcd locations). Once we self-host etcd this wouldn't be necessary

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