Propagated database clone settings to new connections.

    for alias in connections:

        connection = connections[alias]

        settings_dict = connection.creation.get_test_db_clone_settings(_worker_id)

        connection.settings_dict = settings_dict

        # connection.settings_dict must be updated in place for changes to be

        # reflected in django.db.connections. If the following line assigned

        # connection.settings_dict = settings_dict, new threads would connect

        # to the default database instead of the appropriate clone.

        connection.settings_dict.update(settings_dict)

        connection.close()