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=af402e56772d500a72ca9719a74783c592d84cbe
http://github.com/moodle/moodle/commit/af402e56772d500a72ca9719a74783c592d84cbe
+ 2.4 en [shib_invalid_account_error,auth_shibboleth]