Virt getting started guide chapters

[Glen Rundblom]

Hello,
I was looking over the wiki page outline for the virtualization getting 
started guide, and thought two things:

1. Do we need a chapter (3) on why someone should use virtualization
2. I think we should include a chapter about Docker

I was thinking about Docker because to overcome the publican problems in 
Fedora22 I built a Fedora21 image with publican so I can build the 
guides. It occurred to me that it probably should be in the guide as well.

Respectfully,
-Glen