Add CNI config for rkt kubelet (#1579)

roles/kubernetes/node/templates/kubelet.rkt.service.j2

@@ -32,7 +32,7 @@ ExecStart=/usr/bin/rkt run \
         --volume var-lib-docker,kind=host,source={{ docker_daemon_graph }},readOnly=false \
         --volume var-lib-kubelet,kind=host,source=/var/lib/kubelet,readOnly=false,recursive=true \
         --volume var-log,kind=host,source=/var/log \
-{% if kube_network_plugin in ["calico", "weave", "canal"] %}
+{% if kube_network_plugin in ["calico", "weave", "canal", "flannel"] %}
         --volume etc-cni,kind=host,source=/etc/cni,readOnly=true \
         --volume opt-cni,kind=host,source=/opt/cni,readOnly=true \
         --volume var-lib-cni,kind=host,source=/var/lib/cni,readOnly=false \

roles/kubernetes/preinstall/tasks/main.yml

@@ -85,7 +85,7 @@
     - "/etc/cni/net.d"
     - "/opt/cni/bin"
   when:
-    - kube_network_plugin in ["calico", "weave", "canal"]
+    - kube_network_plugin in ["calico", "weave", "canal", "flannel"]
     - inventory_hostname in groups['k8s-cluster']
   tags: [network, calico, weave, canal, bootstrap-os]