python3-pbr: Move src uri checksums out of .inc file

python3-pbr: Move src uri checksums out of .inc file

python2 version of pbr is in meta-python and uses the same inc file but
is not updated synchronously, which ends up breaking it, either we move
py2 version into OE-core as well and then ensure that both recipes are
updated atomically, or we move the checksums into recipe files

Fixes errors like
http://errors.yoctoproject.org/Errors/Details/216253/

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>