bpo-1635741 port _testbuffer to multi-phase init#22003

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koubaa wants to merge 6 commits intopython:masterfrom

koubaa:bpo-1635741-overlapped-testbuffer

Commits on Sep 1, 2020

Commits on Sep 2, 2020

test module state
koubaa
committed

Commits on Sep 6, 2020

Commits on Sep 7, 2020

fix issue
koubaa
committed