Update systemd services for the v0.17.x hyperkube

* Binary asset locations within the upstream hyperkube image
changed https://github.com/kubernetes/kubernetes/pull/84662
* Fix Container Linux and Flatcar Linux kubelet.service
(rkt-fly with fairly dated CoreOS kubelet-wrapper)
* Fix Fedora CoreOS kubelet.service (podman)
* Fix Fedora CoreOS bootstrap.service
* Fix delete-node kubectl usage for workers where nodes may
delete themselves on shutdown (e.g. preemptible instances)

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

@@ -98,6 +98,7 @@ storage:
         inline: |
           KUBELET_IMAGE_URL=docker://k8s.gcr.io/hyperkube
           KUBELET_IMAGE_TAG=v1.17.0
+          KUBELET_IMAGE_ARGS="--exec=/usr/local/bin/kubelet"
     - path: /etc/sysctl.d/max-user-watches.conf
       filesystem: root
       contents:
@@ -118,7 +119,8 @@ storage:
             docker://k8s.gcr.io/hyperkube:v1.17.0 \
             --net=host \
             --dns=host \
-            --exec=/kubectl -- --kubeconfig=/etc/kubernetes/kubeconfig delete node $(hostname)
+            -- \
+            kubectl -- --kubeconfig=/etc/kubernetes/kubeconfig delete node $(hostname)
 passwd:
   users:
     - name: core