location-importer.in: omit historic/orphaned RIR data
Some RIRs include detailled information regarding networks not managed
by or allocated to themselves, particually APNIC. We need to filter
those networks (they usually have a characteristic network name) in
order to prevent operational quirks or returning wrong country codes.
Fixes: #12501
Partially fixes: #12499
Cc: Michael Tremer <michael.tremer@ipfire.org> Signed-off-by: Peter Müller <peter.mueller@ipfire.org> Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>