Adding libvirt setup scenario

Do not merge yet - preview.

It looks like hammer is not yet ready for complete scenario.
I think quotes are not necessary here, otherwise you get

```
libkmod: kmod_config_parse: /etc/modprobe.d/kvm-intel.conf line 1: ignoring bad line starting with '“options'
```
when loading it.

I think it should mention restarting libvirtd & modprobing kvm-intel too, nice work!