Move CNI config and add MTU support for calico-cni

- Move CNI configuration creation for Calico to appropriate
network_plugin role from kubernetes/node.
- Add support for MTU configuration in Calico.

roles/kubernetes/node/tasks/main.yml

@@ -4,13 +4,6 @@
 - include: nginx-proxy.yml
   when: is_kube_master == false and loadbalancer_apiserver_localhost|default(false)
 
-- name: Write Calico cni config
-  template:
-    src: "cni-calico.conf.j2"
-    dest: "/etc/cni/net.d/10-calico.conf"
-    owner: kube
-  when: kube_network_plugin == "calico"
-
 - name: Write kubelet config file
   template: src=kubelet.j2 dest={{ kube_config_dir }}/kubelet.env backup=yes
   notify: