snapshot: implement snapshot roots listing in vbox
Commit 9f5e53e2 introduced the ability to filter snapshots to just roots, but it was never implemented for VBox until now. The VBox implementation prohibits deletion of a snapshot with multiple children. Hence, there can only be at most one root, which is found by searching for the snapshot with a NULL uuid. Prior to 4.0, snapshotGet looked up by UUID, and snapshotFind looked up by name; after that point, snapshotGet disappeared and snapshotFind handles uuid or name. * src/vbox/vbox_tmpl.c (vboxDomainSnapshotNum) (vboxDomainSnapshotListNames): Implement limiting list to root.
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