The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra/+/4e6578d6a755ae9e968cf8336b961955ff3528e4

commit 4e6578d6a755ae9e968cf8336b961955ff3528e4
Author: Jeffrey Li <lijeffrey@chromium.org>
Date: Fri Feb 16 15:25:40 2018

[Findit] Flake Analyzer - New update monorail bug pipeline

1. Moves most bug commenting logic to services/flake_failure/issue_tracking_service.py,
   which is now responsible for all bug-filing and updating operations
2. Removes impossible cases to simplify code, e.g. updating bugs if analyses end in error.

Bug:  807959 
Change-Id: I7ffffe356fe204f3a0ae801c810a83790edb3991
Reviewed-on: https://chromium-review.googlesource.com/919155
Commit-Queue: Jeffrey Li <lijeffrey@chromium.org>
Reviewed-by: Brandon Wylie <wylieb@chromium.org>

[modify] https://crrev.com/4e6578d6a755ae9e968cf8336b961955ff3528e4/appengine/findit/pipelines/flake_failure/update_monorail_bug_pipeline.py
[modify] https://crrev.com/4e6578d6a755ae9e968cf8336b961955ff3528e4/appengine/findit/services/flake_failure/issue_tracking_service.py
[modify] https://crrev.com/4e6578d6a755ae9e968cf8336b961955ff3528e4/appengine/findit/waterfall/flake/flake_constants.py
[modify] https://crrev.com/4e6578d6a755ae9e968cf8336b961955ff3528e4/appengine/findit/services/flake_failure/test/issue_tracking_service_test.py
[add] https://crrev.com/4e6578d6a755ae9e968cf8336b961955ff3528e4/appengine/findit/pipelines/flake_failure/test/update_monorail_bug_pipeline_test.py