Upstream mentioned our ptest-runner could likely be simplified. I had a
look at the output and yes, most of the code in the runner is now obsolete
as upstream output is compatible with what we need. Simplify accordingly.
(From OE-Core rev: 9a9f0a4a062a3c2adf2ac75b4fcdedbb7168335b)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>