(improvement) add HostPolicy to the benchmark suite.

Signed-off-by: Yaniv Kaul <yaniv.kaul@scylldb.com>

Author: mykaul

tests/unit/test_policy_performance.py

@@ -6,6 +6,8 @@
 import statistics
 from unittest.mock import Mock
 
+"A micro-bechmark for performance of policies"
+
 from cassandra.policies import (
     DCAwareRoundRobinPolicy,
     RackAwareRoundRobinPolicy,