Link Jobs

This is a continuance of #7770 and introduces jobs into daemon to fully complete the removal of container graph from daemon. Please review  #7677 and #7770 and merge them before reviewing this.
Guys, this is from a previous pull request that you have already reviewed.

On Aug 28, 2014, at 6:19 PM, Fred Lifton <notifications@github.com> wrote:

> In docs/sources/articles/networking.md:
> 
> > @@ -150,10 +150,10 @@ Four different options affect container domain name services.
> >      `CONTAINER_NAME`.  This lets processes inside the new container
> >      connect to the hostname `ALIAS` without having to know its IP.  The
> >      `--link=` option is discussed in more detail below, in the section
> > -    [Communication between containers](#between-containers). Because
> > -    Docker may assign a different IP address to the linked containers
> > -    on restart, Docker updates the ALIAS entry in the /etc/hosts file
> > -    of the recipient containers.
> > +    [Communication between containers](#between-containers).  Docker updates
> > +    the ALIAS entry in the /etc/hosts file of the recipient containers
> Directory paths take code format. Please add backticks.
> 
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