Raise scheduler/controller-manager replicas in multi-master #312
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* Continue to ensure scheduler and controller-manager run at least two replicas to support performing kubectl edits on single-master clusters (no change) * For multi-master clusters, set scheduler / controller-manager replica count to the number of masters (e.g. a 3-master cluster previously used replicas:2, now replicas:3)
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Motivation:
kube-apiserverhas always been run as a DaemonSet across controllers to provide high availability, butschedulerandcontroller-managerwere always run with replicas 2 (sufficient to support kubectl edits of the control plane without downtime). But if a cluster is running multiple controller nodes, we might as well run a higher replica count, tending toward one per node (users are paying for the nodes either way).