oe-build-perf-report: task and recipe details in html report

This patchset improves the html report generated by scripts/oe-build-perf-report in two ways. First, it will show a short summary of the bitbake tasks of a build. The second part of the patchset will show recipe version changes between two builds.

[YOCTO #11381]
[YOCTO #11382]

The following changes since commit d72d116e0228cc0e4391d0558b2d32c3fd5e399c:

README.qemu: Add from meta-yocto as it belongs in core (2017-09-14 12:39:29 +0100)

are available in the git repository at:

git://git.openembedded.org/openembedded-core-contrib marquiz/fixes-11381
http://cgit.openembedded.org/openembedded-core-contrib/log/?h=marquiz/fixes-11381

Markus Lehtonen (4):
scripts/buildstats-diff: move code to lib/buildstats.py scripts/oe-build-perf-report: summary of task resource usage scripts/buildstats-diff: move more code to lib/buildstats.py scripts/oe-build-perf-report: show recipe version changes in html
report

 scripts/buildstats-diff                 | 340 +++++--------------------------
 scripts/lib/build_perf/html/report.html |  80 +++++++-
 scripts/lib/buildstats.py               | 349 ++++++++++++++++++++++++++++++++
 scripts/oe-build-perf-report            | 105 +++++++---
 4 files changed, 556 insertions(+), 318 deletions(-)
 create mode 100644 scripts/lib/buildstats.py

2.12.3