Revert "Merge pull request #2904 from h2o/kazuho/t50server-starter.t-stability"
Revert "Merge pull request #2904 from h2o/kazuho/t50server-starter.t-stability"

This reverts commit c97fc69d2d5fb03355db4553dca0d1ecba1f90c0, reversing
changes made to c29e1c0f96f4c000a23d853e04328e1ed524d0f8.

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