Revert "do not sleep; use pipes instead"
Revert "do not sleep; use pipes instead"

This reverts commit d4862c52728f666f5c155f08163e157b1e5a7e40.

h2o/h2o,cwyang/h2o,yannick/h2o,cwyang/h2o,yannick/h2o,cwyang/h2o,yannick/h2o,yannick/h2o,h2o/h2o,cwyang/h2o,yannick/h2o,yannick/h2o,h2o/h2o,devnexen/h2o,h2o/h2o,yannick/h2o,h2o/h2o,devnexen/h2o,devnexen/h2o,h2o/h2o,devnexen/h2o,yannick/h2o,devnexen/h2o,devnexen/h2o,cwyang/h2o,cwyang/h2o,devnexen/h2o,cwyang/h2o,devnexen/h2o,h2o/h2o,h2o/h2o,devnexen/h2o,cwyang/h2o,yannick/h2o,h2o/h2o