Commits on Apr 30, 2020

1. Reintroduce support for Python 2.6 to python_stub_template …

   Commit d5012a7 introduced a Python
   2.7 dependency into python_stub_template.txt.  Unfortunately this stub
   is non-hermetic, so even if the user has configured Python 2.7 and 3
   `py_runtime`s, their builds may fail if the system-provided Python is ancient
   (ex: CentOS 6.6 provides Python 2.6.6).
   
   Accommodate ancient Python by reworking the path deduplication in terms
   of a `set` and a generator instead of `collections.OrderedDict`.
   
   Workaround for #11265.
   
   Testing Done:
   - `bazelisk test //src/test/shell/integration:python_stub_test`
   - In a CentOS 6.6 env:
   ```console
   $ /usr/bin/env python -V
   Python 2.6.6
   $ cat >test.py <<EOF
   import sys
   print(sys.executable)
   EOF
   $ cat >BUILD <<EOF
   py_binary(name = "test", srcs = ["test.py"])
   EOF
   $ bazel run :test
   /path/to/my/hermetic/python3
   ```

   

   rbeasley committed Apr 30, 2020
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