Fixup cloudtrail worker to use BytesIO
Fixup cloudtrail worker to use BytesIO

jeffbryner/MozDef,mpurzynski/MozDef,jeffbryner/MozDef,mpurzynski/MozDef,mozilla/MozDef,mozilla/MozDef,mozilla/MozDef,mpurzynski/MozDef,jeffbryner/MozDef,jeffbryner/MozDef,mpurzynski/MozDef,mozilla/MozDef