This is an automated CL created by the recipe roller. This CL rolls
recipe changes from upstream projects (recipe_engine) into this repository.

recipe_engine:
https://chromium.googlesource.com/infra/luci/recipes-py.git/+/7e3be54729659656666407fddc6a29906f1662f8
  7e3be54 (tikuta@chromium.org)
      [cas] use os.environ to get SWARMING_SERVER envvar

More info is at https://goo.gl/zkKdpD. Use https://goo.gl/noib3a to file a bug.

TBR=iannucci@chromium.org

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: Ie07673210ee5a56e258f885c0ae5aa34c77d4eec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2478806Reviewed-by: Recipe Roller <recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Recipe Roller <recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com>