FEATURE: Overhaul of admin API key system (#8284)

- Allow revoking keys without deleting them
- Auto-revoke keys after a period of no use (default 6 months)
- Allow multiple keys per user
- Allow attaching a description to each key, for easier auditing
- Log changes to keys in the staff action log
- Move all key management to one place, and improve the UI

test/javascripts/helpers/create-pretender.js.es6

@@ -611,8 +611,6 @@ export default function() {
       });
     });
 
-    this.post("/admin/users/:user_id/generate_api_key", success);
-    this.delete("/admin/users/:user_id/revoke_api_key", success);
     this.delete("/admin/users/:user_id.json", () =>
       response(200, { deleted: true })
     );