py2to3: update tools/android/*.py to PY3

This is a rollback of commit 91b26dc4f3b327f115787c3ec35278c299480d0c and a
roll-forward of commit ad628ecfb8ed43870fb354e5d8f7da68594f95bd. Original commit
message is below.

Details:
- use six.ensure_str / six.ensure_bytes
- use absl.flags instead of gflags
- put third_party/py/abseil:srcs into @bazel_tools
  so the embedded Android tools can also use it
- remove python_version = "PY2" from py_binary and
  py_test rules (the default is "PY3"), except in
  BUILD.tools, to preserve PY2 compatibility for
  running Bazel (its embedded Python tools)
- added srcs_version = "PY2AND3" to BUILD.tools to
  make it explicit that these libraries are meant
  to be py2 and py3 compatible

See https://github.com/bazelbuild/bazel/issues/10127

PiperOrigin-RevId: 278394040
15 files changed
tree: d1ff411e6b2fe1402fd13041adbafd2b51c1b476
  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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