The ripe importer can now optionally import RIPE route data. In the
context of IntelMQ, this information is useful to e.g. map IP addresses
to ASNs which in turn can be mapped to contact information for
notifications.

This commit contains the changes for main part of this:

 * The download script also downloads the ripe.db.route.gz
   and ripe.db.route6.gz files

 * The database schema has a new table and index for the route
   information

 * The import code optionally loads these files and saves it into the
   database

Notably missing is the database upgrade.

Related to Intevation#15

This adds an update script for the new route_automatic table. The name
script file does not include a version number like the other update
scripts because it's not clear yet which version this file will be
included in.

Related to Intevation#15

The RIPE importer has a new command line option,
--before-commit-command, whose argument is an SQL statement that is
executed by the importer before the transaction that updates the RIPE
data is committed. This command can be used to e.g. cleanup data that
depends on the RIPE data, but which cannot be automatically updated with
'ON DELETE CASCADE' for foreign keys or similar mechanisms.