Author: David Mudrak
MDL-33382 CLI install and upgrade scripts display hint on --allow-unstable in non-interactive mode
http://git.moodle.org/gw?p=moodle.git;a=commit;h=2da7fbc0c291d91b01e182d55b55a4fa5f26b544
http://github.com/moodle/moodle/commit/2da7fbc0c291d91b01e182d55b55a4fa5f26b544
+ 2.3 en [maturityallowunstable,core_admin]