Fix flakey test_remote_query - cql_test.TestCQLSlowQuery test

Patch by Ekaterina Dimitrova, reviwed by brandonwilliams for CASSANDRA-15307
diff --git a/cql_test.py b/cql_test.py
index 0f49561..84ded2b 100644
--- a/cql_test.py
+++ b/cql_test.py
@@ -1116,7 +1116,7 @@
         node1.start(wait_for_binary_proto=True, join_ring=False)  # ensure other node executes queries
         node2.start(wait_for_binary_proto=True,
                     jvm_args=["-Dcassandra.monitoring_report_interval_ms=10",
-                              "-Dcassandra.test.read_iteration_delay_ms=1"])  # see above for explanation
+                              "-Dcassandra.test.read_iteration_delay_ms=2"])  # see above for explanation
 
         session = self.patient_exclusive_cql_connection(node1)