Merge "Source rbesetup.sh from any location inside of a repo directory." am:...

Merge "Source rbesetup.sh from any location inside of a repo directory." am: b2c54c81 am: 9fe95069 am: ce17c8b9 am: efa24bca

Original change: https://android-review.googlesource.com/c/platform/build/+/1441073

Change-Id: I4dabc0e87ab8ca3625e963e0b708625411458fb4