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Closes#1379 from turboFei/async_open_default.
Closes#1379
a7c4c6a1 [Fei Wang] fix ut
cc8d2730 [Fei Wang] Make SESSION_ENGINE_LAUNCH_ASYNC true by default
Authored-by: Fei Wang <fwang12@ebay.com>
Signed-off-by: Fei Wang <fwang12@ebay.com>
4648b63a2c