groonga: don't daemonize until connection can be accepted
groonga: don't daemonize until connection can be accepted

fixes #1326

hiroyuki-sato/groonga,cosmo0920/groonga,groonga/groonga,redfigure/groonga,hiroyuki-sato/groonga,komainu8/groonga,groonga/groonga,groonga/groonga,cosmo0920/groonga,naoa/groonga,komainu8/groonga,naoa/groonga,naoa/groonga,hiroyuki-sato/groonga,redfigure/groonga,cosmo0920/groonga,redfigure/groonga,kenhys/groonga,hiroyuki-sato/groonga,myokoym/groonga,naoa/groonga,redfigure/groonga,cosmo0920/groonga,redfigure/groonga,kenhys/groonga,myokoym/groonga,myokoym/groonga,cosmo0920/groonga,hiroyuki-sato/groonga,groonga/groonga,redfigure/groonga,naoa/groonga,kenhys/groonga,komainu8/groonga,kenhys/groonga,groonga/groonga,myokoym/groonga,groonga/groonga,myokoym/groonga,cosmo0920/groonga,hiroyuki-sato/groonga,kenhys/groonga,redfigure/groonga,naoa/groonga,naoa/groonga,hiroyuki-sato/groonga,cosmo0920/groonga,hiroyuki-sato/groonga,komainu8/groonga,kenhys/groonga,myokoym/groonga,redfigure/groonga,naoa/groonga,cosmo0920/groonga,komainu8/groonga,kenhys/groonga,groonga/groonga,myokoym/groonga,myokoym/groonga,komainu8/groonga,komainu8/groonga,kenhys/groonga,groonga/groonga,komainu8/groonga