Roll Chromite from af5911446cd0 to e6a8f4ed40bb (5 revisions)

https://chromium.googlesource.com/chromiumos/chromite.git/+log/af5911446cd0..e6a8f4ed40bb

2020-10-03 engeg@google.com Instantiate the M87 builders
2020-10-03 yichengli@chromium.org Generate python bindings for artifacts.proto change
2020-10-02 frkoenig@chromium.org trogdor: enable hw tests
2020-10-02 chrome-bot@chromium.org Update config settings by config-updater.
2020-10-02 bmgordon@chromium.org cros lint: Disable warning for local in /bin/sh

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/chromite-chromium-autoroll
Please CC chrome-os-gardeners@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Cq-Include-Trybots: luci.chrome.try:chromeos-betty-pi-arc-chrome;luci.chromium.try:chromeos-kevin-rel
Tbr: chrome-os-gardeners@google.com
Change-Id: I80b5f98880f0ed05705ce23a0903903c131b9e8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2450115
Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#813796}