bpo-1635741: Port _crypt extension module to multiphase initialization(PEP 489)

[shihai1991]

https://bugs.python.org/issue1635741

[codecov]

Codecov Report

Merging #18404 into master will increase coverage by 1.07%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #18404 +/- ## =========================================== + Coverage 82.11% 83.19% +1.07%  =========================================== Files 1955 1570 -385 Lines 588851 414397 -174454 Branches 44428 44429 +1 =========================================== - Hits 483552 344761 -138791 + Misses 95647 59991 -35656 + Partials 9652 9645 -7 

Impacted Files	Coverage Δ
Lib/distutils/tests/test_bdist_rpm.py	30.00% <0.00%> (-65.00%)	⬇️
Lib/distutils/command/bdist_rpm.py	7.63% <0.00%> (-56.88%)	⬇️
Lib/test/test_urllib2net.py	76.92% <0.00%> (-13.85%)	⬇️
Lib/test/test_smtpnet.py	78.57% <0.00%> (-7.15%)	⬇️
Lib/ftplib.py	63.85% <0.00%> (-6.06%)	⬇️
Lib/test/test_ftplib.py	87.11% <0.00%> (-4.72%)	⬇️
Tools/scripts/db2pickle.py	17.82% <0.00%> (-3.97%)	⬇️
Tools/scripts/pickle2db.py	16.98% <0.00%> (-3.78%)	⬇️
Lib/test/test_socket.py	71.94% <0.00%> (-3.77%)	⬇️
Lib/test/test_asyncio/test_base_events.py	91.84% <0.00%> (-3.30%)	⬇️
... and 440 more

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[shihai1991]

@vstinner@ncoghlan@encukou Hi, folks. About porting extension module to pep-489, some extension module have no maintainer or non-active maintainer. So I invite petr(as pep-489 author)、nick(as pep-489 author) and victor(as performance master) help me review a serious of PRs :)

[vstinner]

Thanks, merged.

[shihai1991]

thanks, victor.