Windows dtest 3.0: batch_test failures

FAIL: acknowledged_by_batchlog_not_set_when_batchlog_write_fails_test (batch_test.TestBatch)
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Traceback (most recent call last):
  File "c:\src\cassandra-dtest\batch_test.py", line 133, in acknowledged_by_batchlog_not_set_when_batchlog_write_fails_test
    """, ConsistencyLevel.ONE, received_responses=0)
  File "c:\src\cassandra-dtest\batch_test.py", line 194, in assert_timedout
    assert False, "Expecting TimedOutException, got:" + str(e)
AssertionError: Expecting TimedOutException, got:code=1000 [Unavailable exception] message="Cannot achieve consistency level ONE" info={'required_replicas': 1, 'alive_replicas': 0, 'consistency': 'ONE'}
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FAIL: acknowledged_by_batchlog_set_when_batchlog_write_succeeds_test (batch_test.TestBatch)
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Traceback (most recent call last):
  File "c:\src\cassandra-dtest\batch_test.py", line 145, in acknowledged_by_batchlog_set_when_batchlog_write_succeeds_test
    """, ConsistencyLevel.THREE, received_responses=2)
  File "c:\src\cassandra-dtest\batch_test.py", line 194, in assert_timedout
    assert False, "Expecting TimedOutException, got:" + str(e)
AssertionError: Expecting TimedOutException, got:code=1000 [Unavailable exception] message="Cannot achieve consistency level THREE" info={'required_replicas': 3, 'alive_replicas': 2, 'consistency': 'THREE'}