use ansible_service_mgr to detect init system

roles/network_plugin/flannel/handlers/main.yml

@@ -13,7 +13,7 @@
 
 - name : reload systemd
   shell: systemctl daemon-reload
-  when: init_system == "systemd"
+  when: ansible_service_mgr == "systemd"
 
 - name: reload docker
   service:

roles/network_plugin/flannel/tasks/main.yml

@@ -47,6 +47,6 @@
     src: systemd-docker.service
     dest: /lib/systemd/system/docker.service
   notify: restart docker
-  when: init_system == "systemd"
+  when: ansible_service_mgr == "systemd"
 
 - meta: flush_handlers

roles/network_plugin/flannel/templates/docker

@@ -1,5 +1,5 @@
 # Deployed by Ansible
-{% if init_system == "sysvinit" and kube_network_plugin == "flannel" and ansible_os_family == "Debian" %}
+{% if ansible_service_mgr in ["sysvinit","upstart"] and kube_network_plugin == "flannel" and ansible_os_family == "Debian" %}
 DOCKER_OPTS="--bip={{ flannel_subnet }} --mtu={{ flannel_mtu }}"
 {% elif kube_network_plugin == "flannel" %}
 OPTIONS="--bip={{ flannel_subnet }} --mtu={{ flannel_mtu }}"