bug 1017923 - more gecko_migration.py fixes for merge day. r=rail
bug 1017923 - more gecko_migration.py fixes for merge day. r=rail

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