Load a target snapshot to a database
dbsnapper load command loads a snapshot to a database and takes a
snapshot_index as arguments.
target_name is the name of the target defined in the configuration file.
snapshot_index is the index number of the snapshot to load.
If a sanitized snapshot at this exists at this `snapshot_index`, it will be loaded
unless the `--original` flag is set.
The snapshot is loaded to the database specified in the
dst_url parameter of the target configuration.
This is a destructive operation and any database that exists at `dst_url` will be dropped and recreated!