Move docker systemd unit creation to docker role

Creating the unit using default settings early on
and then changing it during network_plugin section
leads to too many docker restarts and duplicated code.

Reversed Wants= dependence on docker.service so it does not
restart docker when reloading systemd

Consolidated all docker restart handlers.

roles/network_plugin/flannel/handlers/main.yml

@@ -4,22 +4,6 @@
   ignore_errors: yes
   notify: restart docker
 
-- name: restart docker
-  command: /bin/true
-  notify:
-    - Flannel | reload systemd
-    - Flannel | reload docker
-    - Flannel | reload kubelet
-
-- name : Flannel | reload systemd
-  shell: systemctl daemon-reload
-  when: ansible_service_mgr == "systemd"
-
-- name: Flannel | reload docker
-  service:
-    name: docker
-    state: restarted
-
 - name: Flannel | reload kubelet
   service:
     name: kubelet

roles/network_plugin/flannel/tasks/main.yml

@@ -50,11 +50,4 @@
     state: link
   when: ansible_os_family == "CoreOS"
 
-- name: Flannel | Write docker.service systemd file
-  template:
-    src: systemd-docker.service
-    dest: /lib/systemd/system/docker.service
-  notify: restart docker
-  when: ansible_service_mgr == "systemd" and ansible_os_family != "CoreOS"
-
 - meta: flush_handlers

roles/network_plugin/flannel/templates/systemd-docker.service

@@ -1,32 +0,0 @@
-[Unit]
-Description=Docker Application Container Engine
-Documentation=http://docs.docker.com
-{% if ansible_os_family == "RedHat" %}
-After=network.target docker-storage-setup.service
-Wants=docker-storage-setup.service
-{% elif ansible_os_family == "Debian" %}
-After=network.target docker.socket
-Wants=docker.socket
-{% endif %}
-
-[Service]
-Type=notify
-EnvironmentFile=-/etc/default/docker
-Environment=GOTRACEBACK=crash
-ExecReload=/bin/kill -s HUP $MAINPID
-Delegate=yes
-KillMode=process
-ExecStart=/usr/bin/docker daemon \
-          $OPTIONS \
-          $DOCKER_STORAGE_OPTIONS \
-          $DOCKER_NETWORK_OPTIONS \
-          $INSECURE_REGISTRY \
-          $DOCKER_OPTS
-LimitNOFILE=1048576
-LimitNPROC=1048576
-LimitCORE=infinity
-MountFlags=slave
-TimeoutStartSec=1min
-
-[Install]
-WantedBy=multi-user.target