Disable Kubelet 127.0.0.1.10248 healthz endpoint

* Kubelet runs a healthz server listening on 127.0.0.1:10248
by default. Its unused by Typhoon and can be disabled
* https://kubernetes.io/docs/reference/command-line-tools-reference/kubelet/

google-cloud/container-linux/kubernetes/workers/cl/worker.yaml

@@ -73,6 +73,7 @@ systemd:
           --cluster_domain=${cluster_domain_suffix} \
           --cni-conf-dir=/etc/kubernetes/cni/net.d \
           --exit-on-lock-contention \
+          --healthz-port=0 \
           --kubeconfig=/etc/kubernetes/kubeconfig \
           --lock-file=/var/run/lock/kubelet.lock \
           --network-plugin=cni \