disable kelp update test

frameworks/Perl/kelp/benchmark_config.json

@@ -7,7 +7,6 @@
       "db_url": "/db",
       "query_url": "/queries?queries=",
       "fortune_url": "/fortunes",
-      "update_url": "/update?queries=",
       "plaintext_url": "/plaintext",
       "port": 8080,
       "approach": "Realistic",
@@ -30,7 +29,6 @@
       "db_url": "/db",
       "query_url": "/queries/mongo?queries=",
       "fortune_url": "/fortunes/mongo",
-      "update_url": "/update/mongo?queries=",
       "plaintext_url": "/plaintext",
       "port": 8080,
       "approach": "Realistic",