Migrate the AppArmor usertags DB + script + configuration out of Alioth

Originally created by @intrigeri on #15446 (Redmine)

IIRC pkg-apparmor’s usertags bot runs on u’s account on Alioth, whose shutdown is scheduled on May 1st. As I’ve asked you on the pkg-apparmor mailing list, please share the code + DB + configuration (cronjob?) so I can migrate it elsewhere :)