Author: Iñaki Arenaza
MDL-3941 auth/cas auth/ldap enrol/ldap Add support for LDAP-TLS.
Credit goes to Chris Bandy for proposing the initial patch.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=326929d54a4d65f84933c6c26f42cbe7c4b79b0f
http://github.com/moodle/moodle/commit/326929d54a4d65f84933c6c26f42cbe7c4b79b0f
+ 2.5 en [start_tls,auth_ldap]
+ 2.5 en [start_tls_key,auth_ldap]