use ansible_service_mgr to detect init system

roles/kubernetes/preinstall/tasks/main.yml

@@ -15,24 +15,6 @@
       paths:
       - ../vars
 
-- name: "Identify init system"
-  shell: >
-    $(pgrep systemd > /dev/null && systemctl status network.target > /dev/null);
-    if [ $? -eq 0 ] ; then
-      echo systemd;
-    else
-      echo sysvinit;
-    fi
-  always_run: True
-  register: init_system_output
-  changed_when: False
-  tags: always
-
-- set_fact:
-    init_system: "{{ init_system_output.stdout }}"
-  always_run: True
-  tags: always
-
 - name: Create kubernetes config directory
   file:
     path: "{{ kube_config_dir }}"
@@ -56,7 +38,7 @@
     path: "{{ kube_log_dir }}"
     state: directory
     owner: kube
-  when: init_system == "sysvinit"
+  when: ansible_service_mgr in ["sysvinit","upstart"]
 
 - name: Create cni directories
   file: