Fold sma2-download script into sma2mon master script

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Add db schema update logic to handle the pre-pvoutput support db format

The truly earliest database format which had no information related to
pvoutput.org.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Add subcommand to sma2mon to create / schema update database

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>