servlet3-cass: add missing update_url + fix query_url in benchmark_config

frameworks/Java/servlet3-cass/benchmark_config

@@ -20,10 +20,11 @@
       "notes": "",
       "versus": "servlet3-cass"
     },
-    "raw": {
+    "cassandra": {
       "setup_file": "setup",
       "db_url": "/servlet3-cass/db",
-      "query_url": "/servlet3-cass/db?queries=",
+      "query_url": "/servlet3-cass/queries?queries=",
+      "update_url": "/servlet3-cass/updates?queries=",
       "port": 8080,
       "approach": "Realistic",
       "classification": "Platform",