Revert "Merge pull request #12637 from ichard26/refactor/imports" #12676
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This reverts commit 71a08a7, reversing changes made to 22142d6.
One possible fix for #12675.
This patch made the pip self-version check import
pip._internal.self_outdated_check
on demand. This blows up when downgrading (and possibly upgrading) pip as it imports the module after the downgrade, which is problematic as the older self-check logic is incompatible with the rest of the pip already loaded into memory.