Right now, testcloud just calls virt-install to create the domain. This presents a couple odd, quirky issues - namely extra stuff printed to stdout that we neither want nor care about. virt-install also does a bunch of other stuff we don't really need or care about (after all, it is expecting for something to be installed - not just booted). I suspect using virt-install is also what's causing some of the random, hard to reproduce bugs @tflink and I have been seeing.

So, we should move things to just working with libvirt directly. This should make the code a lot cleaner (dealing with domain XML aside) and easier to work on.