Author: Koen Nys
MDL-57686 auth/db: added pdo support.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=bb9f8451b7c734c80404dda8e5432132438e80b7
http://github.com/moodle/moodle/commit/bb9f8451b7c734c80404dda8e5432132438e80b7
+ 3.3 en [auth_dbhost,auth_db]
+ 3.3 en [auth_dbname,auth_db]
+ 3.3 en [dbhost_desc,enrol_database]