vagrant-libvirt support

This commits adds basic support to use the Vagrantfile with vagrant-libvirt 
plugin.
On Mon, Dec 1, 2014 at 6:20 AM, Michal Fojtik <notifications@github.com> wrote:
>
> @danmcp @iNecas shouldn't we own this image, so we can add/remove/configure things inside, like a configure Docker the way we do with Virtualbox/AWS image, and other things? I'm also fine with having all this customization done in the shell script.
>
> Next question is, who will maintain this image/provider? ;-)

As I mentioned, you're welcome to use my tools to build your own... As
an aside, I'm pretty sure the other images listed are all built by
others.