Github user yvsubhash commented on the issue:
https://github.com/apache/cloudstack/pull/1726
@ustcweizhou Volume snapshots would be left over even in case of normal vm
destroy and that is expected. They can be used if there is a need to restore
the volume at a later point in time. The snapshots are visible under
storage->snapshots. So i dont see a need to clean up those snapshots
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