groonga: use batch mode when command is specified by command line
groonga: use batch mode when command is specified by command line

Without this change, command prompt is broken on Mac OS X.

Reported by @soundkitchen. Thanks!!!

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