issue23962 - Reference the correct TimeoutError in concurrent.futures documentation.

Patch contributed by Ryder Lewis.

Patch contributed by Ryder Lewis.

The previous test relied on a remote server, which currently seems to be
shutting the connection down once TLS has been set up, causing an EOFError.
Now the test is implemented using a minimal NNTP server running in a
background thread.

Some dependencies of pip import threading module unconditionally so
we need to skip the test to make buildbots happy.

Some dependencies of pip import threading module unconditionally so
we need to skip the test to make buildbots happy.

in old Python 3 versions (3.4.3 and lower).

in old Python 3 versions (3.4.3 and lower).

Issue #26100:

* Add subprocess._optim_args_from_interpreter_flags()
* Add test.support.optim_args_from_interpreter_flags()
* Use new functions in distutils, test_cmd_line_script, test_compileall and
  test_inspect

The change enables test_details() test of test_inspect when -O or -OO command
line option is used.

Issue #26101: Exclude Lib/test/ from sys.path in test_compilepath(). The
directory contains invalid Python files like Lib/test/badsyntax_pep3120.py,
whereas the test ensures that all files can be compiled.

Issue26017 - Suggest enclosing command args in double quotes when using characters which get interpreted by shell.

Issue26017 - Suggest enclosing command args in double quotes when using characters which get interpreted by shell.

Re-encode CREDITS.txt to utf-8 and open it with 'utf-8'.

Issue26135 - In the tutorial section on modules, reference importlib.reload instead of imp.reload.