test: execute "bundle update" in grntest only when Gemfile is updated by git
test: execute "bundle update" in grntest only when Gemfile is updated by git

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