Removed versus value

Grizzly is a platform/web-server and does not build on any other framework we have listed here.

grizzly-bm/benchmark_config

@@ -18,7 +18,7 @@
       "database_os": "Linux",
       "display_name": "grizzly",
       "notes": "",
-      "versus": "servlet"
+      "versus": ""
     }
   }]
 }