Add IO stats and getrusage() data to the task statistics. We
also drop the CPU percentage calculation since its pretty arbitrary
and not very accurate/useful.
In particular we can now see the user and sys times as well as the
wall clock times.
(From OE-Core rev: b849130f71d3ba32a6fa94c291ca6ce7c7c3b3d1)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>