Fix security hole in auto-vouching domains
Fix security hole in auto-vouching domains

Thanks to @evilpie for catching this one! Secures the code
committed in bug 684255.

anistark/mozillians,akarki15/mozillians,johngian/mozillians,ChristineLaMuse/mozillians,mozilla/mozillians,hoosteeno/mozillians,brian-yang/mozillians,glogiotatidis/mozillians-new,justinpotts/mozillians,chirilo/mozillians,akatsoulas/mozillians,akarki15/mozillians,safwanrahman/mozillians,glogiotatidis/mozillians-new,anistark/mozillians,johngian/mozillians,johngian/mozillians,brian-yang/mozillians,justinpotts/mozillians,johngian/mozillians,glogiotatidis/mozillians-new,chirilo/mozillians,ChristineLaMuse/mozillians,hoosteeno/mozillians,akatsoulas/mozillians,glogiotatidis/mozillians-new,satdav/mozillians,akarki15/mozillians,satdav/mozillians,safwanrahman/mozillians,chirilo/mozillians,hoosteeno/mozillians,fxa90id/mozillians,fxa90id/mozillians,anistark/mozillians,fxa90id/mozillians,akatsoulas/mozillians,mozilla/mozillians,akatsoulas/mozillians,satdav/mozillians,brian-yang/mozillians,mozilla/mozillians,anistark/mozillians,justinpotts/mozillians,satdav/mozillians,justinpotts/mozillians,akarki15/mozillians,safwanrahman/mozillians,fxa90id/mozillians,chirilo/mozillians,brian-yang/mozillians,ChristineLaMuse/mozillians,safwanrahman/mozillians,mozilla/mozillians,hoosteeno/mozillians