Fix snitch_test.py
Fix snitch_test.py

pcmanus/cassandra-dtest,iamaleksey/cassandra-dtest,stef1927/cassandra-dtest,pauloricardomg/cassandra-dtest,blerer/cassandra-dtest,pauloricardomg/cassandra-dtest,blerer/cassandra-dtest,iamaleksey/cassandra-dtest,stef1927/cassandra-dtest