Instead of separate rusage and child rusage values, only store their sum
value in buildstats. This is a big reduction in data footprint without
really losing any interesting data.
Also, utilize OrderedDict to order data more logically.
[YOCTO #10582]
(From OE-Core rev: 70c41bb721c00ed2abbb88d273eebc3a8bb01f5d)
Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>