document StatefulSet vs Deployment, leadership election

[pohly]

We probably don't have good documentation about when to use StatefulSet and when to use Deployment for the controller. See container-storage-interface/spec#364

Leadership election needs to be covered, too.

[saad-ali]

+1 on documentation for how to run controller components HA (i.e. how to enable leader election for our controller sidecars).

[msau42]

The design doc was recently updated with some information: kubernetes/community@52469a1

[msau42]

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