MDL-55117 behat: Re-initialise to ensure modified config is not used

As behat cli process is 1 run for features
Any modification in  will be reflected
in later runs on cli. In this case
- disabling enablebadges in block_badges.feature
- reflected while running cron in award_badges.feature

lib/behat/classes/util.php

@@ -342,5 +342,9 @@ class behat_util extends testing_util {
 
         // Inform data generator.
         self::get_data_generator()->reset();
+
+        // Initialise $CFG with default values. This is needed for behat cli process, so we don't have modified
+        // $CFG values from the old run. @see set_config.
+        initialise_cfg();
     }
 }