Update benchmark_config as well.

dart/benchmark_config

@@ -3,11 +3,11 @@
   "tests": [{
     "default": {
       "setup_file": "setup",
-      "json_url": "/",
+      "json_url": "/json",
       "db_url": "/db",
-      "query_url": "/db?queries=",
+      "query_url": "/queries?queries=",
       "fortune_url": "/fortunes",
-      "update_url": "/update?queries=",
+      "update_url": "/updates?queries=",
       "plaintext_url": "/plaintext",
       "port": 8080,
       "sort": 129