Author: Odei Alba
MDL-46778 behat: Allow different database for behat
http://git.moodle.org/gw?p=moodle.git;a=commit;h=15c7a4bd57f3d2721dd0016ba5ddb0471ff4ea17
http://github.com/moodle/moodle/commit/15c7a4bd57f3d2721dd0016ba5ddb0471ff4ea17
+ 4.0 en [erroruniqueconfig,tool_behat]