Fixes YOCTO #3684
These changes help tie in the relationship between how the OE
build system uses checksums and such and the PR Service that
can track revision.
(From yocto-docs rev: 39a3010a3bb4b2c1d37aef60984ac16e85b56aac)
Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>