drupal 7 support broken

... and yet another regression I introduced when I reshuffled the cloaking code - I broke drupal 7 verify, install, and so on.

Symptom:

Notice: Undefined index: driver in /srv/aegir/platforms/drupal-7.0-2.8-production/includes/database/database.inc on line 1565
Notice: Undefined index: driver in include_once() (line 23 of /srv/aegir/platforms/drupal-7.0-2.8-production/sites/example.com/settings.php).
Notice: Undefined offset: 4 in Database::parseConnectionInfo() (line 1413 of /srv/aegir/platforms/drupal-7.0-2.8-production/includes/database/database.inc).
Notice: Undefined index: driver in Database::openConnection() (line 1565 of /srv/aegir/platforms/drupal-7.0-2.8-production/includes/database/database.inc).
Notice: Undefined index: driver in Database::openConnection() (line 1565 of /srv/aegir/platforms/drupal-7.0-2.8-production/includes/database/database.inc).
Notice: Undefined index: driver in Database::openConnection() (line 1565 of /srv/aegir/platforms/drupal-7.0-2.8-production/includes/database/database.inc).
Warning: Cannot modify header information - headers already sent by (output started at /srv/aegir/platforms/drupal-7.0-2.8-production/includes/database/database.inc:1565) in drupal_send_headers() (line 1040 of /srv/aegir/platforms/drupal-7.0-2.8-production/includes/bootstrap.inc).
DatabaseDriverNotSpecifiedException: Driver not specified for this database connection: default in Database::openConnection() (line 1566 of /srv/aegir/platforms/drupal-7.0-2.8-production/includes/database/database.inc).

hotfix: change the driver to a db_type in the D7 array. patch coming up shortly.