k8s-reboot-coordinator: Initial deploy

The `k8s-reboot-coordinator` coordinates node reboots throughout the
cluster.  It runs as a DaemonSet, watching for the presence of a
sentinel file, `/run/reboot-needed` on the node.  When the file appears,
it acquires a lease, to ensure that only one node reboots at a time,
cordons and drains the node, and then triggers the reboot by running
a command on the host.  After the node has rebooted, the daemon will
release the lock and uncordon the node.

k8s-reboot-coordinator/service.yaml

@@ -0,0 +1,14 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: &name k8s-reboot-coordinator
+  labels: &labels
+    app.kubernetes.io/name: *name
+    app.kubernetes.io/component: *name
+    app.kubernetes.io/part-of: *name
+spec:
+  selector: *labels
+  ports:
+  - port: 8000
+    targetPort: http
+    name: http