apt: use self-build jessie,stretch box
apt: use self-build jessie,stretch box

official box is not released yet, so use our box until then.

naoa/groonga,naoa/groonga,kenhys/groonga,komainu8/groonga,cosmo0920/groonga,cosmo0920/groonga,komainu8/groonga,komainu8/groonga,naoa/groonga,groonga/groonga,komainu8/groonga,cosmo0920/groonga,cosmo0920/groonga,komainu8/groonga,naoa/groonga,groonga/groonga,kenhys/groonga,naoa/groonga,cosmo0920/groonga,groonga/groonga,groonga/groonga,groonga/groonga,cosmo0920/groonga,cosmo0920/groonga,cosmo0920/groonga,kenhys/groonga,kenhys/groonga,groonga/groonga,kenhys/groonga,groonga/groonga,naoa/groonga,komainu8/groonga,kenhys/groonga,naoa/groonga,naoa/groonga,komainu8/groonga,kenhys/groonga,groonga/groonga,komainu8/groonga,kenhys/groonga