restored previous tty behavior of tests
restored previous tty behavior of tests

zerovm/zerovm,zerovm/zerovm,cuihaoliang/zerovm,cuihaoliang/zerovm,cuihaoliang/zerovm,zerovm/zerovm,cuihaoliang/zerovm,zerovm/zerovm,cuihaoliang/zerovm,zerovm/zerovm