[toolchain-utils] Update waterfall reports.

This CL updates the waterfall reports to use the results of
'cros buildresult' and the new URLS.  It removes the attempts to
track individual test failures, as the new URL system no longer
allows that.

BUG=chromium:829648
TEST=launched reports from my directory. They worked fine.
Tested buildbot_test_llvm.py changes with mobiletc-prebuild
on chrotomation2.

Change-Id: I12cf97c7960b032ec3caca636fe349f564369378
Reviewed-on: https://chromium-review.googlesource.com/1021990
Commit-Ready: Caroline Tice <cmtice@chromium.org>
Tested-by: Caroline Tice <cmtice@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
2 files changed