use ansible_service_mgr to detect init system

roles/kubernetes/master/tasks/main.yml

@@ -18,7 +18,7 @@
     src: "kube-apiserver.service.j2"
     dest: "/etc/systemd/system/kube-apiserver.service"
     backup: yes
-  when: init_system == "systemd"
+  when: ansible_service_mgr == "systemd"
   notify: restart kube-apiserver
 
 - name: install | Write kube-apiserver initd script
@@ -28,7 +28,7 @@
     owner: root
     mode: 0755
     backup: yes
-  when: init_system == "sysvinit" and ansible_os_family == "Debian"
+  when: ansible_service_mgr in ["sysvinit","upstart"] and ansible_os_family == "Debian"
 
 - name: Write kube-apiserver config file
   template:

roles/kubernetes/master/tasks/start.yml

@@ -4,7 +4,7 @@
 
 - name: reload systemd
   command: systemctl daemon-reload
-  when: init_system == "systemd" and restart_apimaster is defined and restart_apimaster == True
+  when: ansible_service_mgr == "systemd" and restart_apimaster is defined and restart_apimaster == True
 
 - name: reload kube-apiserver
   service: