Adding 1MB as default buffer size in GetObjectRequest

ds3/ds3.py

@@ -11250,7 +11250,7 @@ def get_service(self, request):
             raise TypeError('request for get_service should be of type GetServiceRequest but was ' + request.__class__.__name__)
         return GetServiceResponse(self.net_client.get_response(request), request)
 
-    def get_object(self, request, buffer_size=None):
+    def get_object(self, request, buffer_size=1048576):
         if not isinstance(request, GetObjectRequest):
             raise TypeError('request for get_object should be of type GetObjectRequest but was ' + request.__class__.__name__)
         return GetObjectResponse(self.net_client.get_response(request), request, buffer_size)