backing out 90dfbcb12d53 for scripts/b2g_build.py only.
backing out 90dfbcb12d53 for scripts/b2g_build.py only.

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