Remove unused handlers from Flannel CNI (#4984)

* Only reload docker when is_atomic for Flannel

* Remove unused handlers from Flannel CNI

roles/network_plugin/flannel/handlers/main.yml

@@ -1,62 +0,0 @@
----
-- name: Flannel | delete default docker bridge
-  command: ip link delete docker0
-  failed_when: false
-  notify: Flannel | restart docker
-
-- name: Flannel | delete flannel interface
-  command: ip link delete flannel.1
-  failed_when: false
-
-# special cases for atomic because it defaults to live-restore: true
-# So we disable live-restore to pickup the new flannel IP.  After
-# we enable it, we have to restart docker again to pickup the new
-# setting and restore the original behavior
-- name: Flannel | restart docker
-  command: /bin/true
-  notify:
-    - Flannel | reload systemd
-    - Flannel | reload docker.socket
-    - Flannel | configure docker live-restore true (atomic)
-    - Flannel | reload docker
-    - Flannel | pause while Docker restarts
-    - Flannel | wait for docker
-
-- name: Flannel | reload systemd
-  systemd:
-    daemon_reload: true
-
-- name: Flannel | reload docker.socket
-  service:
-    name: docker.socket
-    state: restarted
-  when: ansible_os_family in ['CoreOS', 'Container Linux by CoreOS']
-
-- name: Flannel | configure docker live-restore true (atomic)
-  replace:
-    name: /etc/docker/daemon.json
-    regexp: '"live-restore":.*true'
-    replace: '"live-restore": false'
-  when: is_atomic
-
-- name: Flannel | reload docker
-  service:
-    name: docker
-    state: restarted
-
-- name: Flannel | pause while Docker restarts
-  pause:
-    seconds: 10
-    prompt: "Waiting for docker restart"
-
-- name: Flannel | wait for docker
-  command: "{{ docker_bin_dir }}/docker images"
-  register: docker_ready
-  retries: 10
-  delay: 5
-  until: docker_ready.rc == 0
-
-- name: Flannel | reload kubelet
-  service:
-    name: kubelet
-    state: restarted