split network plugins into distinct roles

roles/network_plugin/tasks/main.yml

@@ -1,30 +0,0 @@
----
-- name: "Test if network plugin is defined"
-  fail: msg="ERROR, One network_plugin variable must be defined (Flannel or Calico)"
-  when: ( kube_network_plugin is defined and kube_network_plugin == "calico" and kube_network_plugin == "flannel" ) or
-        kube_network_plugin is not defined
-
-- include: flannel.yml
-  when: kube_network_plugin == "flannel"
-
-- name: Set docker daemon options
-  template:
-    src: docker
-    dest: "{{ '/etc/sysconfig/docker-network' if ansible_os_family == 'RedHat' else '/etc/default/docker' }}"
-    owner: root
-    group: root
-    mode: 0644
-  notify:
-    - restart docker
-
-- name: Write docker.service systemd file
-  template:
-    src: systemd-docker.service
-    dest: /lib/systemd/system/docker.service
-  notify: restart docker
-  when: init_system == "systemd"
-
-- meta: flush_handlers
-
-- include: calico.yml
-  when: kube_network_plugin == "calico"