kubelet: Use install-packages service

The packages for the Kubelet are now installed by the
*install-packages* service, so they can be processed int he same
transaction as other packages (e.g. collectd).

install-kubelet.service

@@ -1,19 +0,0 @@
-# vim: set ft=systemd :
-[Unit]
-Description=Install Kubernetes/Kubelet
-After=network-online.target
-Wants=network-online.target
-Before=zincati.service
-ConditionPathExists=!/usr/bin/kubectl
-
-[Service]
-Type=oneshot
-RemainAfterExit=yes
-ExecStart=/usr/bin/rpm-ostree install --apply-live --allow-inactive \
-	cri-o \
-	iscsi-initiator-utils \
-	kubernetes-node \
-	kubernetes-kubeadm
-
-[Install]
-WantedBy=multi-user.target

kubelet.yaml

@@ -1,26 +1,43 @@
 variant: fcos
 version: 1.4.0
+ignition:
+  config:
+    merge:
+    - local: packages.ign
+
 storage:
   files:
-  - path: /etc/systemd/system/install-kubelet.service
-    contents:
-      local: install-kubelet.service
+  - path: /etc/ignition/packages.d/kubelet
     mode: 0644
+    contents:
+      inline: |
+        cri-o
+        kubernetes-node
+        kubernetes-kubeadm
+
   - path: /etc/modules-load.d/k8s.conf
     contents:
       inline: |+
         br_netfilter
+
   - path: /etc/sysctl.d/k8s.conf
     contents:
       inline: |+
         net.bridge.bridge-nf-call-iptables = 1
         net.bridge.bridge-nf-call-ip6tables = 1
         net.ipv4.ip_forward = 1
+
   links:
   - path: /etc/resolv.conf
     overwrite: true
     target: ../run/systemd/resolve/resolv.conf
+
+  - path: /etc/systemd/system/after-install.target.wants/crio.service
+    target: /usr/lib/systemd/system/crio.service
+
 systemd:
   units:
-  - name: install-kubelet.service
+  - name: crio.service
+    enabled: true
+  - name: kubelet.service
     enabled: true