#491904 - remove old database and db account after migration

db_server/migrate.provision.inc

+<?php
+// $Id$
+
+function drush_provision_mysql_provision_migrate_validate() {
+  provision_db_connect();
+}
+
+// Deletes the old database credentials
+function drush_provision_mysql_post_provision_migrate($url) {
+  return  _provision_mysql_destroy_site_db(drush_get_option('db_name'), drush_get_option('db_user'), drush_get_option('db_passwd'));
+}