Don't replace custom query handler if graph is being used

tests/integration/__init__.py

@@ -342,6 +342,8 @@ def use_cluster(cluster_name, nodes, ipformat=None, start=True, workloads=[]):
     try:
         jvm_args = []
         # This will enable the Mirroring query handler which will echo our custom payload k,v pairs back
+
+        if 'graph' not in workloads:
             if PROTOCOL_VERSION >= 4:
                 jvm_args = [" -Dcassandra.custom_query_handler_class=org.apache.cassandra.cql3.CustomPayloadMirroringQueryHandler"]
         if(len(workloads) > 0):