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

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

Change-Id: I0904c522ad2566755a64e2bc3c88eeacb4ae2a14