virsh: added --all flag to freecell command
virsh: added --all flag to freecell command

This will iterate over all NUMA nodes, showing
free memory for each and sum at the end.
Existing default behavior is not changed.
(cherry picked from commit 30e21374ea30b5b70fdc0a101e3002a8c78498c9)

Signed-off-by: Steve Hodgson <eb20a6615749cf04ff61aa37e18f749ed6d01446@solarflare.com>

sshah-solarflare/Libvirt-PCI-passthrough-,sshah-solarflare/Libvirt-PCI-passthrough-,sshah-solarflare/Libvirt-PCI-passthrough-,sshah-solarflare/Libvirt-PCI-passthrough-,sshah-solarflare/Libvirt-PCI-passthrough-