Configure a drive that can be shared between the guests

[zspencer]

To make it a bit easier to manage projects, I want to make sure I can share a projects directory across whatever guest happens to be running at a particular time.

I think the way to do this is to use LVM and share the same volume across guests: https://serverfault.com/questions/287070/how-to-mount-virtual-machines-lvm-partition-on-kvm-host