Adding support for canal network plugin

This patch provides support for Canal network plugin installation
as a self-hosted app, see the following link for details:

https://github.com/tigera/canal/tree/master/k8s-install

roles/kubernetes/node/tasks/main.yml

@@ -11,6 +11,13 @@
     owner: kube
   when: kube_network_plugin == "calico"
 
+- name: Write Canal cni config
+  template:
+    src: "cni-canal.conf.j2"
+    dest: "/etc/cni/net.d/10-canal.conf"
+    owner: kube
+  when: kube_network_plugin == "canal"
+
 - name: Write kubelet config file
   template: src=kubelet.j2 dest={{ kube_config_dir }}/kubelet.env backup=yes
   notify:

roles/kubernetes/node/templates/cni-canal.conf.j2

@@ -0,0 +1,17 @@
+{
+  "name": "canal-k8s-network",
+  "type": "flannel",
+  "delegate": {
+    "type": "calico",
+    "etcd_endpoints": "{{ etcd_access_endpoint }}",
+    "log_level": "info",
+    {% if enable_network_policy is defined and enable_network_policy == True %}
+      "policy": {
+        "type": "k8s"
+      },
+    {% endif %}
+    "kubernetes": {
+      "kubeconfig": "{{ kube_config_dir }}/node-kubeconfig.yaml"
+    }
+  }
+}

roles/kubernetes/node/templates/kubelet.j2

@@ -26,7 +26,7 @@ KUBELET_ARGS="--cluster_dns={{ dns_server }} --cluster_domain={{ dns_domain }} -
 {% else %}
 KUBELET_ARGS="--kubeconfig={{ kube_config_dir}}/kubelet.kubeconfig --config={{ kube_manifest_dir }} --pod-infra-container-image={{ pod_infra_image_repo }}:{{ pod_infra_image_tag }}"
 {% endif %}
-{% if kube_network_plugin is defined and kube_network_plugin in ["calico", "weave"] %}
+{% if kube_network_plugin is defined and kube_network_plugin in ["calico", "weave", "canal"] %}
 KUBELET_NETWORK_PLUGIN="--network-plugin=cni --network-plugin-dir=/etc/cni/net.d"
 {% elif kube_network_plugin is defined and kube_network_plugin == "weave" %}
 DOCKER_SOCKET="--docker-endpoint=unix:/var/run/weave/weave.sock"