Merge pull request #1407 from dhermes/ditch-iso-level

Removing use of isolation level in datastore.

Author: dhermes

gcloud/datastore/connection.py

@@ -288,8 +288,6 @@ def begin_transaction(self, project):
         :returns: The serialized transaction that was begun.
         """
         request = _datastore_pb2.BeginTransactionRequest()
-        request.isolation_level = (
-            _datastore_pb2.BeginTransactionRequest.SERIALIZABLE)
         response = self._rpc(project, 'beginTransaction', request,
                              _datastore_pb2.BeginTransactionResponse)
         return response.transaction

gcloud/datastore/test_connection.py

@@ -664,7 +664,6 @@ def test_begin_transaction(self):
         rq_class = datastore_pb2.BeginTransactionRequest
         request = rq_class()
         request.ParseFromString(cw['body'])
-        self.assertEqual(request.isolation_level, rq_class.SERIALIZABLE)
 
     def test_commit_wo_transaction(self):
         from gcloud._testing import _Monkey