Add XHR patch to handle external auth correctly
Add XHR patch to handle external auth correctly

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