Update pip, & prep for customization - #70

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aalexanderr:update-pip

Commits on Oct 4, 2021

Bump pip's src from 20.1.1 to 21.2.4
aalexanderr
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faa7ffd
Remove unused files from fetchcode.vcs.pip
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c75ff01
Fix import paths after vendored pip update
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f7b5479
Remove unused code from pip._internal
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ffeec50
Re-comment parts of pip's VersionControl.obtain
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7613108
Fix tests after pip update
aalexanderr
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61dd1dd
Remove pip's vendoring in favor of setup.cfg
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d2ee74f
Add tests for pip's vcs module from pip
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a498455
Adjust pip-AUTHORS.txt after update
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6c1dcd4
Add copyright and license to pip's files
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bc2e544
Further cleanup - unused code and style fixes
aalexanderr
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f049705
Unify CI env var for tests
aalexanderr
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2c81eab