Change upstart stop consul result

terraform/aws/scripts/upstart.conf

@@ -6,6 +6,8 @@ stop on runlevel [!2345]
 respawn
 # This is to avoid Upstart re-spawning the process upon `consul leave`
 normal exit 0 INT
+# stop consul will not mark node as failed but left
+kill signal INT
 
 script
   if [ -f "/etc/service/consul" ]; then