Use cgroup paths for stats and removal

This builds on the commit in #266 and implements removal of the cgroups via these paths and a simple `os.RemoveAll`.

This also removes systemd's version of getstats because we already have the raw paths that were setup during apply.  This allows the normal fs code to collect stats at these paths.  

This should also fix the issues in: #200

Fixes #198
Closes #200 
Closes #266
We don't use it in cadvisor. It also allowed direct testing and stats from
cgroups, but I think only I used it that way.

 I can remove it from libcontainer.

On Mon, Nov 17, 2014 at 11:07 AM, Victor Marmol <notifications@github.com>
wrote:

> In cgroups/cgutil/cgutil.go:
>
> > @@ -24,26 +24,6 @@ var createCommand = cli.Command{
> >  	Action: createAction,
>
> This is a CLI, I'm not sure who uses it. We planned to use it for cAdvisor
> before we just integrated all of libcontainer. @rjnagal
> <https://github.com/rjnagal> may know more. Maybe remove if we don't want
> to maintain it?
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/docker/libcontainer/pull/267/files#r20456497>.
>