Check vm.overcommit_memory kernel parameter value
Check vm.overcommit_memory kernel parameter value

fixes #1289

vm.overcommit_memory should be 1 to avoid breaking DB, remaining locks
and so on by failing malloc() and mmap().

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