Author: Michael Aherne
MDL-36101 auth_shibboleth Show appropriate error message for suspended accounts
http://git.moodle.org/gw?p=moodle.git;a=commit;h=41db2a5afc47e12cb1dc9157918201ad0aa476cb
http://github.com/moodle/moodle/commit/41db2a5afc47e12cb1dc9157918201ad0aa476cb
+ 2.3 en [shib_invalid_account_error,auth_shibboleth]