Fixed runlevel on nginx upstart file

nginx/templates/upstart.jinja

@@ -3,8 +3,8 @@
 description "nginx http daemon"
 author "George Shammas <georgyo@gmail.com>"
  
-start on (filesystem and net-device-up IFACE=lo)
-stop on runlevel [!2345]
+start on (runlevel [345] and started network)
+stop on (runlevel [!345] or stopping network)
  
 env DAEMON=/usr/sbin/nginx