Author: Eloy Lafuente (stronk7)
MDL-54901 environment: pg93, openssl, https & utf8mb4
http://git.moodle.org/gw?p=moodle.git;a=commit;h=22983bd4da4e73147fe33d8004cf0f71524c79dd
http://github.com/moodle/moodle/commit/22983bd4da4e73147fe33d8004cf0f71524c79dd
+ 3.1 en [ishttpswarning,core_admin]
+ 3.1 en [opensslrequired,core_admin]