Open Cluster Management: one hub, many klusterlets

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Open Cluster Management architecture: an operator creates and accepts clusters through the hub API server; on the hub a registration controller, a placement controller and a work controller handle ManagedCluster, Placement and ManifestWork; on each managed cluster the klusterlet registration agent dials the hub to register and send heartbeats, and the work agent pulls ManifestWork, reports status and applies the resources locally.