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barbican alway use default notification driver (defalt '') so we should change this value according to whether enable notification Change-Id: Ia17a64fe9bf31042369dec19f1f76b1ab8592288
barbican alway use default notification driver (defalt '') so we should change this value according to whether enable notification Change-Id: Ia17a64fe9bf31042369dec19f1f76b1ab8592288