Revert 64fcfdc3a14176378696f9ab9f7ebdd16ae538cf
Revert 64fcfdc3a14176378696f9ab9f7ebdd16ae538cf

We found that the increased instance size didn't improve build time significantly

mpurzynski/MozDef,jeffbryner/MozDef,gdestuynder/MozDef,gdestuynder/MozDef,gdestuynder/MozDef,mozilla/MozDef,Phrozyn/MozDef,mpurzynski/MozDef,jeffbryner/MozDef,mozilla/MozDef,Phrozyn/MozDef,mozilla/MozDef,Phrozyn/MozDef,mozilla/MozDef,mpurzynski/MozDef,jeffbryner/MozDef,jeffbryner/MozDef,mpurzynski/MozDef,Phrozyn/MozDef,gdestuynder/MozDef