Author: Adrian Greeve
MDL-61131 repositories: Added a key to verify incoming urls.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=5912eca97ec720386f197a01fa55ea7950461c5b
http://github.com/moodle/moodle/commit/5912eca97ec720386f197a01fa55ea7950461c5b
+ 3.3 en [missingsourcekey,core_repository]
+ 3.3 en [sourcekeymismatch,core_repository]