move snapshot details out of the main scope (and into per-vm scope)?

[ryran]

What if we moved all the multiline snapshot details from the main valine output and into the per-VM output (e.g., valine SOMEVM) ...?

We could then keep the main valine output to 1 line for each VM ... and we could add mem/cpu limit details -- maybe even including virt-top percentages as mentioned in another issue. I'd love to get some feedback from people on this.