snapshot: virsh snapshot-list and children
Sometimes, we only care about one branch of the snapshot hierarchy. Make it easier to list a single branch, by using the new APIs. Technically, I could emulate these new virsh options on old servers by doing a complete dump, then scraping xml to filter out just the snapshots that I care about, but I didn't want to do that in this patch. * tools/virsh.c (cmdSnapshotList): Add --from, --descendants. * tools/virsh.pod (snapshot-list): Document them.
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