remove bug sendStdin
remove bug sendStdin

sendStdin is useless, we don't wait for the stdin,
we only wait for stdout.

sendStdin is bug, when stdin&stdout closed at the same
time, we will blocked forever on sendStdin

Signed-off-by: Lai Jiangshan <b337eedf453972390e4695e362aeea2634ef4e0c@gmail.com>

feiskyer/hyper,gao-feng/hyper-public,laijs/hyper,laijs/hyperd,bergwolf/hyperd,laijs/hyperd,feiskyer/hyper,hyperhq/hyper,gnawux/hyper,ZJU-SEL/hyper,hyperhq/hyper,bergwolf/hyperd,ZJU-SEL/hyper,gao-feng/hyper,feiskyer/hyper,hyperhq/hyperd,bergwolf/hyperd,gnawux/hyper,gao-feng/hyper-public,gao-feng/hyper,hyperhq/hyperd,gnawux/hyper,feiskyer/hyper,bergwolf/hyperd,hyperhq/hyper,gao-feng/hyper-public,gao-feng/hyper,laijs/hyper,gao-feng/hyper,laijs/hyper,hyperhq/hyperd,ZJU-SEL/hyper,laijs/hyper,laijs/hyperd,ZJU-SEL/hyper,hyperhq/hyper