httpd: support per location groonga database
httpd: support per location groonga database

Before this change, "location /d/" only supported.
After this change, the following configuration is available:

  ...
    location /d/ {
      groonga;
      groonga_database ...;
    }

    location /database1/ {
      groonga;
      groonga_database ...;
    }

    location /database2/ {
      groonga;
      groonga_database ...;
    }
  ...

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