kill timeout needed for docker containers to restart gracefully

Author: RyanShelf

docker/files/upstart.conf

@@ -3,6 +3,8 @@ start on filesystem and started docker
 stop on runlevel [06]
 respawn
 
+kill timeout 20
+
 {#- Ugly, but covers the cases where variable evaluates to false, is empty, or non-existent #}
 {%- set runoptions = container.get("runoptions", []) %}
 {%- set stopoptions = container.get("stopoptions", []) %}