If an interface doesn't exist yet when vnStat is started, it won't be
monitored, as only existing interfaces can be added to the database via
the vnstat command.

This adds a hotplug script which adds any configured interfaces to the
vnStat database when it goes up.

Signed-off-by: Jan Hoffmann <jan@3e8.eu>

By default, vnstatd adds all available interfaces on startup when its
database is empty. The --noadd option prevents this, but it breaks
import of legacy databases, and causes vnstatd to exit immediately
after startup, which breaks reloading.

This changes the init script to add the --noadd option when no legacy
databases need to be imported, and patches vnstatd to keep running
even when no interfaces are configured.

Signed-off-by: Jan Hoffmann <jan@3e8.eu>

Signed-off-by: Jan Hoffmann <jan@3e8.eu>

This introduces an additional package for version 2 of vnStat.

Signed-off-by: Jan Hoffmann <jan@3e8.eu>