support ubuntu upstart in __start_on_boot

Signed-off-by: Nico Schottelius <nico@freiheit.schottelius.org>

cdist/conf/type/__start_on_boot/explorer/state

@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# 2012-2013 Nico Schottelius (nico-cdist at schottelius.org)
+# 2012-2015 Nico Schottelius (nico-cdist at schottelius.org)
 # 2013 Daniel Heule (hda at sfs.biz)
 #
 # This file is part of cdist.
@@ -34,10 +34,15 @@ case "$os" in
             || echo absent)
     ;;
 
-    debian|ubuntu|openwrt)
+    debian|openwrt)
         state="present"
         [ -f "/etc/rc$runlevel.d/S"??"$name" ] || state="absent"
     ;;
+    ubuntu)
+        state="absent"
+        [ -f "/etc/rc$runlevel.d/S"??"$name" ] && state="present"
+        [ -f "/etc/init/${name}.conf" ] && state="present"
+    ;;
 
     amazon|centos|fedora|owl|redhat)
         state=$(chkconfig --level "$runlevel" "$name" || echo absent)