Transaction tests that use readConcern "snapshot" are failing with snapshot errors

 [2019/03/28 12:03:13.278] ERROR [0.046s]: test_transactions_transaction-options_defaultTransactionOptions_override_client_options (test_transactions.TestTransactions)

 [2019/03/28 12:03:13.278] ----------------------------------------------------------------------

 [2019/03/28 12:03:13.278] Traceback (most recent call last):

 [2019/03/28 12:03:13.278]   File "/data/mci/d8892024d3a11d251a760e386d482e5d/src/test/__init__.py", line 410, in wrap

 [2019/03/28 12:03:13.278]     return f(*args, **kwargs)

 [2019/03/28 12:03:13.278]   File "/data/mci/d8892024d3a11d251a760e386d482e5d/src/test/__init__.py", line 410, in wrap

 [2019/03/28 12:03:13.278]     return f(*args, **kwargs)

 [2019/03/28 12:03:13.278] writing manifest file 'pymongo.egg-info/SOURCES.txt'

 [2019/03/28 12:03:13.278] running build_ext

 [2019/03/28 12:03:13.278] Skipping test 'Valid options specific to single-threaded drivers are parsed correctly'

 [2019/03/28 12:03:13.278]   File "/data/mci/d8892024d3a11d251a760e386d482e5d/src/test/__init__.py", line 410, in wrap

 [2019/03/28 12:03:13.278]     return f(*args, **kwargs)

 [2019/03/28 12:03:13.278]   File "/data/mci/d8892024d3a11d251a760e386d482e5d/src/test/test_transactions.py", line 764, in run_scenario

 [2019/03/28 12:03:13.278]     self.run_operations(sessions, collection, test['operations'])

 [2019/03/28 12:03:13.278]   File "/data/mci/d8892024d3a11d251a760e386d482e5d/src/test/test_transactions.py", line 209, in run_operations

 [2019/03/28 12:03:13.278]     result = self.run_operation(sessions, collection, op.copy())

 [2019/03/28 12:03:13.278]   File "/data/mci/d8892024d3a11d251a760e386d482e5d/src/test/test_transactions.py", line 297, in run_operation

 [2019/03/28 12:03:13.278]     result = cmd(**dict(arguments))

 [2019/03/28 12:03:13.278]   File "/data/mci/d8892024d3a11d251a760e386d482e5d/src/pymongo/collection.py", line 694, in insert_one

 [2019/03/28 12:03:13.278]     session=session),

 [2019/03/28 12:03:13.278]   File "/data/mci/d8892024d3a11d251a760e386d482e5d/src/pymongo/collection.py", line 608, in _insert

 [2019/03/28 12:03:13.278] Skipping test 'Invalid serverSelectionTryOnce causes a warning'

 [2019/03/28 12:03:13.278]     bypass_doc_val, session)

 [2019/03/28 12:03:13.278]   File "/data/mci/d8892024d3a11d251a760e386d482e5d/src/pymongo/collection.py", line 596, in _insert_one

 [2019/03/28 12:03:13.278]     acknowledged, _insert_command, session)

 [2019/03/28 12:03:13.278]   File "/data/mci/d8892024d3a11d251a760e386d482e5d/src/pymongo/mongo_client.py", line 1342, in _retryable_write

 [2019/03/28 12:03:13.278]     return self._retry_with_session(retryable, func, s, None)

 [2019/03/28 12:03:13.278]   File "/data/mci/d8892024d3a11d251a760e386d482e5d/src/pymongo/mongo_client.py", line 1295, in _retry_with_session

 [2019/03/28 12:03:13.278]     return func(session, sock_info, retryable)

 [2019/03/28 12:03:13.278]   File "/data/mci/d8892024d3a11d251a760e386d482e5d/src/pymongo/collection.py", line 591, in _insert_command

 [2019/03/28 12:03:13.278]     retryable_write=retryable_write)

 [2019/03/28 12:03:13.278]   File "/data/mci/d8892024d3a11d251a760e386d482e5d/src/pymongo/pool.py", line 579, in command

 [2019/03/28 12:03:13.278]     unacknowledged=unacknowledged)

 [2019/03/28 12:03:13.278]   File "/data/mci/d8892024d3a11d251a760e386d482e5d/src/pymongo/network.py", line 150, in command

 [2019/03/28 12:03:13.278]     parse_write_concern_error=parse_write_concern_error)

 [2019/03/28 12:03:13.278]   File "/data/mci/d8892024d3a11d251a760e386d482e5d/src/pymongo/helpers.py", line 155, in _check_command_response

 [2019/03/28 12:03:13.278]     raise OperationFailure(msg % errmsg, code, response)

 [2019/03/28 12:03:13.278] pymongo.errors.OperationFailure: Transaction 4100415a-2791-450b-8998-bce3117f3fb9:1 was aborted on statement 0 due to: a non-retryable snapshot error :: caused by :: Encountered error from localhost:27217 during a transaction :: caused by :: Read timestamp Timestamp(1553799789, 74) is older than the oldest available timestamp.