Author: Petr Skoda
MDL-47834 auth: Allow enforcing of login limits
http://git.moodle.org/gw?p=moodle.git;a=commit;h=89e9321f96dcd1c61f051723b1ec0ee29f609347
http://github.com/moodle/moodle/commit/89e9321f96dcd1c61f051723b1ec0ee29f609347
+ 2.9 en [limitconcurrentlogins,core_auth]
+ 2.9 en [limitconcurrentlogins_desc,core_auth]