Reland #5 of "[swarming] Use go client to collect task"

This is a reland of https://chromium-review.googlesource.com/c/chromium/tools/build/+/1369476

fix from previous try in swarming/api.py:
python client exit with non-zero status when swarming task exit with failure, but go client does not.
Let me handle exit status in recipe side for go client.

Also enable go client only for win7_chromium_rel_ng and 'Win7 Tests (1)' this time.

Confirming the behavior in
$ led get-build 8927247050970809440 | led edit-recipe-bundle | led launch
https://chromium-swarm.appspot.com/task?id=41c0ea1f39423910

$ led get-builder luci.chromium.try:win7_chromium_rel_ng | led edit-recipe-bundle | led launch
https://chromium-swarm.appspot.com/task?id=41c1192e28f44510

Bug: 868878, 894045, 914009
Change-Id: I1e93035c07f807fdca7223203ec9871a4e6e2ab9
Recipe-Nontrivial-Roll: build_limited_scripts_slave
Reviewed-on: https://chromium-review.googlesource.com/c/1372185
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
13 files changed
tree: 004176bbbb29fa12e327c2ae57ad4a7ae164f1af
  1. infra/
  2. masters/
  3. scripts/
  4. site_config/
  5. slave/
  6. tests/
  7. third_party/
  8. .gitattributes
  9. .gitignore
  10. .vpython
  11. codereview.settings
  12. DEPS
  13. environment.cfg.py
  14. LICENSE
  15. OWNERS
  16. PRESUBMIT.py
  17. README.md
  18. WATCHLISTS
README.md

build

Hi build contributor! If you do any change in scripts/master/ or touching any master's html/ directories, you must restart master.chromium.fyi first and ensure that it still works before restarting other masters.

Recipes

If you're here to make a change to ‘recipes’ (the code located in scripts/slave/recipes*), please take a look at the README for more information pertaining to recipes.