4.0b3 build2 deb signing configs. bug 615696, r=joduinn
4.0b3 build2 deb signing configs. bug 615696, r=joduinn

simar7/build-mozharness,lundjordan/mozharness,kartikgupta0909/mozilla-mozharness,armenzg/build-mozharness,kartikgupta0909/build-mozharness,simar7/build-mozharness,kartikgupta0909/gittest,mrrrgn/build-mozharness,lundjordan/mozharness,walac/build-mozharness,kartikgupta0909/build-mozharness,lissyx/build-mozharness,kartikgupta0909/mozilla-mozharness,escapewindow/mozharness,kartikgupta0909/gittest,mozilla/build-mozharness,mozilla/build-mozharness,walac/build-mozharness,lissyx/build-mozharness,armenzg/build-mozharness,mrrrgn/build-mozharness,escapewindow/mozharness