Patch written by Carlo Beccarini <hackdiablo.cb@gmail.com>.

* test_contains() did not override anything
* test_expandtabs/upper/lower() in FixedStringTest were masking usable tests
  in string_tests. These tests now get run for bytearray() and bytes().
* test_expandtabs/upper/lower() in buffer_tests were only run on bytearray()
  and are redundant with string_tests

Test test_wrong_cert() runs a server that rejects the client's certificate,
so ECONNRESET is reasonable in addition to SSLError. On the other hand, the
other three tests don't even need to run a server because they are just
testing the parsing of invalid certificate files.

Also fix a ResourceWarning by closing the wrapped socket.

Accept time delta up to 0.12 second, instead of 0.11, for the "AMD64 FreeBSD
9.x" buildbot slave.

Issue #26248, patch written by Ben Hoyt:

1) Clarify that the return values of is_dir()/is_file()/etc are cached
   separately for follow_symlinks True and False.
2) Be more specific about when the functions require a system call, and how it
   relates to caching and follow_symlinks.
3) DRY up common stuff between is_dir and is_file by saying "Caching, system
   calls made, and exceptions raised are as per is_dir" in is_file.
4) Tweak to the first paragraph of docs for is_dir/is_file to simplify: assume
   the follow_symlinks=True default, then note the follow_symlinks=False
   non-default case after.

invalid pattern.

Patch by Thomas Nyberg.

invalid pattern.

Patch by Thomas Nyberg.

This will hopefully make maintenance of venv documentation easier.
For example, see commits a4f0d76af176 and 5764cc02244d.

This patch has been reviewed by Vinaj Sajip, the maintainer of
venv module.

* Update description of the --system-site-packages option
* Show --copies option in the usage

Based on patch by Hagen Fürstenau and Daniel Urban.

* Update description of the --system-site-packages option
* Show --copies option in the usage

Testing for a non-existing certificate file is already done in test_errors().
Copy wrongcert.pem from Python 2 and use it to test the behaviour with a
mismatched certificate.

non-atomic attributes.

non-atomic attributes.

of PyArg_Parse*() functions.

of PyArg_Parse*() functions.

* Issue #25234: Skip test_eintr.test_open() under OS X to avoid hanging
* Issue #25868: Try to make test_eintr.test_sigwaitinfo() more reliable
  especially on slow buildbots. Use a pipe to synchronize the parent and the
  child processes.