Blog: Add guides to setup Cobbler in libvirt

[SchoolGuy]

This PR aims to add three new posts:

1. Basic setup to automate installing inside the libvirt network.
2. State of the project
3. Advances setup to automate installing both inside and outside of a libvirt network.

@ycedres ages ago you said that you are interested to have such a setup at home. I would kindly ask you to help me co-author this blog post and check what I described in these posts.

[ByteOtter]

I need to give it another look, these two nitpicks I found so far.

[SchoolGuy]

Thanks for the suggestions @ByteOtter. I would like us to sit down next week and fix these things together. My writing skills are not the best and as such I am deeply dependant on your input and help.

[SchoolGuy]

The first guide works as good as it possibly can atm. The second guide will be extended tomorrow.

Edit: Doing this with openSUSE wasn't a good idea it seems. The template is horribly outdated it seems. I will try and fix that after this PR is in with 3.3.4...

[ByteOtter]

I went over the first article and added some comments. Most of them are simple wording or grammar nitpicks which you can accept at your discretion.

Apart from that I liked the guide generally, though I do have some personal gripes with it.
Some of the steps, while it is clear what to do, do not provide a reason why you do this. What the step is good for and why Cobbler requires it to be done this way. Maybe you could add a couple more sentences here and there to explain why we are doing this.
If these intricacies are already explained elsewhere a link to another article would be great too.

[ByteOtter]

Went over and suggested some annotations. Again, mostly smaller nitpicks here and there about punctuation and wording.
Other than that I like how you expanded the articles, they are much more coherent and easier to follow and understand.