implement rfc8305 (Happy Eyeballs V2) using separate calls to h2o_hostinfo_getaddr() for each address family
implement rfc8305 (Happy Eyeballs V2)
using separate calls to h2o_hostinfo_getaddr() for each address family

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