recipe engine: remove explicit cwd default in step recipe module

This was added in https://codereview.chromium.org/1115453002
to run on swarming.

We no longer need this, because we're using kitchen with swarmbucket now,
which is a different environment.

This is a step towards removing infra-specific paths from the recipe engine.

BUG=chromium:605919

Review URL: https://codereview.chromium.org/1925593002
46 files changed
tree: 3e712a8b62e82f06ace6e8d19c1bbe326c96a0bc
  1. doc/
  2. go/
  3. infra/
  4. misc/
  5. recipe_engine/
  6. recipe_modules/
  7. recipes/
  8. unittests/
  9. .gitignore
  10. codereview.settings
  11. LICENSE
  12. OWNERS
  13. PRESUBMIT.py
  14. README.md
  15. recipes.py
  16. WHITESPACE
README.md

Recipes

Recipes are a domain-specific language (embedded in python) for specifying sequences of subprocess calls in a cross-platform and testable way.