Being able to tell the bitbake processes apart is useful for debugging.
Add a helper function which allows this without making it a hard
dependency. Errors are ignored, this is just nice to have.
(Bitbake rev: fd7f1a94d196b8a3c445e313d9e699b352b1da97)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>