snapshot: virsh fallback for snapshot-list --tree --from
Emulating --from requires grabbing the entire list of snapshots and their parents, and recursively iterating over the list from the point of interest - but we already do that for --tree. This turns on emulation for that situation. * tools/virsh.c (__vshControl): Rename member. (vshReconnect, cmdConnect, vshGetSnapshotParent): Update clients. (cmdSnapshotList): Add fallback.
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