Author: David Mudrak
MDL-31832 CLI upgrade checks if the upgrade is actually needed
http://git.moodle.org/gw?p=moodle.git;a=commit;h=91c038f932e2509d1331b2ad2acb23ce2662d80d
http://github.com/moodle/moodle/commit/91c038f932e2509d1331b2ad2acb23ce2662d80d
+ 2.3 en [cliupgradenoneed,core_admin]