Author: Charles Fulton
MDL-35130 shibboleth: remove hard-coded string
http://git.moodle.org/gw?p=moodle.git;a=commit;h=3ee53f7e7fc6b3a1823c9af31f3f73d7d50bde38
http://github.com/moodle/moodle/commit/3ee53f7e7fc6b3a1823c9af31f3f73d7d50bde38
+ 2.3 en [auth_shib_contact_administrator,auth_shibboleth]