[libvirt] Snapshot: Request to review patch

Hi all, Could someone please review https://www.redhat.com/archives/libvir-list/2017-October/msg01333.html This patch is based on comments from Jiri Denemark ( https://www.redhat.com/archives/libvir-list/2017-October/msg01275.html ) This patch potentially fixes https://bugzilla.redhat.com/show_bug.cgi?id=1494471 Thanks, Madhu.