Issue #20167: revise condition to accomodate message change.

--HG--
branch : 3.4
Merge with 3.4
Issue 1519638: Now unmatched groups are replaced with empty strings in re.sub()
and re.subn().
Issue #22584: Got rid of character tables in _sre.c and use standard macros
Py_TOLOWER, Py_ISSPACE, etc.
Issue #19380: Optimized parsing of regular expressions.
Issue #22591: Drop support of MS-DOS

Drop support of MS-DOS, especially of the DJGPP compiler (MS-DOS port of GCC).

Today is a sad day. Good bye MS-DOS, good bye my friend :'-(
Issue #22564: ssl doc: fix typos

--HG--
branch : 3.4
extra : amend_source : 17f2b8d69458e22058082418b892453b1f79c721
Issue #22564: ssl doc: document read(), write(), pending, server_side and
server_hostname methods and attributes of SSLSocket.

--HG--
branch : 3.4
extra : histedit_source : 60e21dc0a2db652cadbff05dcf36d26e47d8a2ae
Issue #22564: ssl doc: use "class" marker to document the SSLSocket class

--HG--
branch : 3.4
extra : histedit_source : c4d2c36ff2808980fdd5f4b22d25cc84ae73260a
Issue #22564: ssl doc: mention how SSLSocket are usually created

--HG--
branch : 3.4
extra : histedit_source : 942b39aeefb13f07afb8f99dcf046d91ae26834f
Merge 3.4
Issue #22564: ssl doc: mention asyncio in the non-blocking section

--HG--
branch : 3.4
extra : amend_source : 729ad9c7f66778ad25ffb5ce1f28ff3057de64c8
Merge 3.4
Issue #22564: ssl doc: reorganize and reindent documentation of SSLObject and
MemoryBIO; move documentation of SSLContext.wrap_bio()
Issue #22564: ssl doc, add more links to the non-blocking section
Issue #22564: cleanup SSLObject doc

--HG--
extra : amend_source : be92267a27fec887b8d2aec34c54557796c1ed8c
Issue #21456: Skip two tests in test_urllib2net.py if _ssl module not present.

Patch by Remi Pointel.

--HG--
branch : 3.4
Issue #21456: Skip two tests in test_urllib2net.py if _ssl module not present.

Patch by Remi Pointel.
test_venv: use support.rmtree() instead of shutil.rmtree() to fix sporadic
failures on Windows

--HG--
branch : 3.4
(Merge 3.4) test_venv: use support.rmtree() instead of shutil.rmtree() to fix
sporadic failures on Windows