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2ec13bc1ce
Ensure that bootstrap+clientcert-rotation in the Kubelet can: 1. happen in the background so that static pods aren't blocked by bootstrap 2. collapse down to a single call path for requesting a CSR 3. reorganize the code to allow future flexibility in retrieving bootstrap creds Fetching the first certificate and later certificates when the kubelet is using client rotation and bootstrapping should share the same code path. We also want to start the Kubelet static pod loop before bootstrapping completes. Finally, we want to take an incremental step towards improving how the bootstrap credentials are loaded from disk (potentially allowing for a CLI call to get credentials, or a remote plugin that better integrates with cloud providers or KSMs). Reorganize how the kubelet client config is determined. If rotation is off, simplify the code path. If rotation is on, load the config from disk, and then pass that into the cert manager. The cert manager creates a client each time it tries to request a new cert. Preserve existing behavior where: 1. bootstrap kubeconfig is used if the current kubeconfig is invalid/expired 2. we create the kubeconfig file based on the bootstrap kubeconfig, pointing to the location that new client certs will be placed 3. the newest client cert is used once it has been loaded Kubernetes-commit: 0af19875add7deb562b2cf7bf6b1d273c44bab1b