Bug 831788. Allow for a B2G build to specify an 'upload_platform' from the source code. r=aki
Bug 831788. Allow for a B2G build to specify an 'upload_platform' from the source code. r=aki

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