Add back fortune URLs in dart-stream

dart-stream/benchmark_config

@@ -6,6 +6,7 @@
       "json_url": "/json",
       "db_url": "/db",
       "query_url": "/queries?queries=",
+      "fortune_url": "/fortunes",
       "update_url": "/updates?queries=",
       "plaintext_url": "/plaintext",
       "port": 8080,
@@ -15,6 +16,7 @@
       "setup_file": "setup",
       "db_url": "/db-mongo",
       "query_url": "/queries-mongo?queries=",
+      "fortune_url": "/fortunes-mongo",
       "update_url": "/updates-mongo?queries=",
       "port": 8080,
       "sort": 246