kubelet-csr-approver: Initial commit

The [kubelet-csr-approver][0] is a controller that automatically approves
CSRs for Kublets that match certain criteria.  I've had it deployed in
the cluster for a while, but apparently never committed the resources.
These manifest files are taken from the [k8s deployment example][1] in
the upstream repository.

[0]: https://github.com/postfinance/kubelet-csr-approver
[1]: https://github.com/postfinance/kubelet-csr-approver/tree/v1.2.10/deploy/k8s

kubelet-csr-approver/serviceaccount.yaml

@@ -0,0 +1,5 @@
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: kubelet-csr-approver
+  namespace: kube-system