Author: Safat
MDL-81924 factor_sms: Remove leftover AWS implementation
Originally implemented as MDL-80962.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=cceed874fd2e8742cf8dca44177a8003737cfb06
http://github.com/moodle/moodle/commit/cceed874fd2e8742cf8dca44177a8003737cfb06
+ 4.5 en [settings:gateway,factor_sms]