fix for #246
fix for #246

ftests.sh problems with /dev/tty in Jenkins

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