roles/nginx: Use systemd module instead of service

roles/nginx/handlers/main.yml

@@ -1,5 +1,5 @@
 ---
 - name: reload nginx
-  service: name=nginx state=reloaded
+  systemd: name=nginx state=reloaded
 
 # vim: set ts=2 sw=2:

roles/nginx/tasks/main.yml

@@ -52,7 +52,7 @@
   tags: nginx
 
 - name: Start and enable nginx service
-  service: name=nginx state=started enabled=yes
+  systemd: name=nginx state=started enabled=yes
   tags: nginx
 
 # vim: set ts=2 sw=2: