py2to3: update more *.py files to PY3

Details:
- use six.ensure_*
- use absl.flags instead of gflags
- BUILD files with a BUILD.tools file: the BUILD
  uses "PY3" and BUILD.tools uses "PY2"
- BUILD files without a BUILD.tools file use the
  PY_BINARY_VERSION variable, whose value is "PY3"
  in the source tree but "PY2" in @bazel_tools.
  Rationale: this retains compatibility with
  Python2 runtimes for users who just want to run
  Bazel (and its embedded Python scripts) but
  don't build Bazel itself.
PiperOrigin-RevId: 278601455
20 files changed
tree: 899fa5764b8c16aef350f4b78d713af6bfa9e748
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODEOWNERS
  15. combine_distfiles.py
  16. combine_distfiles_to_tar.sh
  17. compile.sh
  18. CONTRIBUTING.md
  19. CONTRIBUTORS
  20. distdir.bzl
  21. ISSUE_TEMPLATE.md
  22. LICENSE
  23. README.md
  24. WORKSPACE
README.md

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