Setuptools

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Misc
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* 3002: Suppress AttributeError when detecting get-pip.

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Changes
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* 2993: In _distutils_hack, bypass the distutils exception for pip when get-pip is being invoked, because it imports setuptools.

Misc
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* 2989: Merge with pypa/distutils788cc159. Includes fix for config vars missing from sysconfig.

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Changes
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* 2974: Setuptools now relies on the Python logging infrastructure to log messages. Instead of using ``distutils.log.*``, use ``logging.getLogger(name).*``.
* 2987: Sync with pypa/distutils2def21c5d74fdd2fe7996ee4030ac145a9d751bd, including fix for missing get_versions attribute (2969), more reliance on sysconfig from stdlib.

Misc
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* 2962: Avoid attempting to use local distutils when the presiding version of Setuptools on the path doesn't have one.
* 2983: Restore 'add_shim' as the way to invoke the hook. Avoids compatibility issues between different versions of Setuptools with the distutils local implementation.

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Misc
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* 2980: Bypass distutils loader when setuptools module is no longer available on sys.path.

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Changes
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* 2958: In distutils_hack, only add the metadata finder once. In ensure_local_distutils, rely on a context manager for reliable manipulation.
* 2963: Merge with pypa/distutilsa5af364910. Includes revisited fix for pypa/distutils15 and improved MinGW/Cygwin support from pypa/distutils77.

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Misc
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* 2960: Install schemes fall back to default scheme for headers.