fixes #284, runit finish script to stop a container

[xmik]

See #284.

[xmik]

I think the runit service (chef resource) option: restart_on_update should be set to false, to not restart docker container when the runit script is updated. I will test it more. For now it failed with the data container, it tried to restart not running container.

[xmik]

I tested on data container (not running as a daemon) and on not data container (running as a daemon) and it works for me. The virtual machine I tested on:

vagrant@vm:~$ cat /etc/debian_version 
7.5
vagrant@vm:~$ uname -r
3.14-0.bpo.2-amd64

Edit: all the failures of Travis build concern /etc/default/docker file, they do not concern this pull request.

[bflad]

This seems good to me -- I'll get this in. Thanks!