This also improves the cipd manifest canned check to produce unique
names in order to debug PRESUBMIT's more easily.

Adds onto
  https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/708354

R=maruel@chromium.org, tandrii@chromium.org, vadimsh@chromium.org

Bug:
Change-Id: I9f086996998608092a4d23f5c98fbac34117a9e4
Reviewed-on: https://chromium-review.googlesource.com/811445Reviewed-by: Vadim Shtayura <vadimsh@chromium.org>
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>