Fix pylint 2.4 new warnings.

Attempting to match Python 3.8 fixes in subprocess.py, especially on Windows.

Attempting to fix psutil-related regression in PyPy 7.2

corrected a typo in comments

* Fix tests with TLS1.3

There were hidden assumptions about the order in which greenlets would run.

TLS1.3 changed the handshake in a way that broke those assumptions.

* Attempting to fix the appveyor backdoor test timeouts.

Suspect a buffering issue. Trying to fix by disabling Nagle's algorithm.

Also a cleaner separation of concerns in the backdoor server.

* Brute-force debugging.

* Tweak the backlog and simultaneous accept settings, and drop the extra event listeners we don't need.

* max_accept=1 and dropping the events fixed test__backdoor on windows.

probably it was just the events. test that.

* Brute force debugging for the SSL issues.

* Some of the windows ssl issues may be due to fileno reuse and hence incorrectly multiplexed watchers?

* Even more care with socket lifetimes.

On Python 3.7, use the newer wrapping form that the stdlib uses to create the _sslobj.

* More debugging.

* The preferred method of unwrapping differs on 3.6 and 3.7+

* Checking ordering.

* Partial success, hopefully.

* Lots of progress. Try again.

* More Windows work.

* D'oh. Test cases from 3.7.4 handle some of these issues more gracefully so we will just use them.

* Tweaks.

* Having a hard time getting 3.7 updated on Travis. Try to force the issue.

* Yet another weird error from appveyor.

Add support for Python 3.8b4

Still needs the specific networking test classes added, but all the basics pass for me. Lets see about CI.

Dynamic class in gevent.resolver.thread.Resolver.__repr__

Fix references to six.PY3 in case python4 becomes a thing

monkey: allow to execute a module rather than only a script

API docs: remove duplicated entries for gevent.{queue,server}

Fixes: b7c9a1df ("Reorganize docs.")

The class name used in `gevent.resolver.thread.Resolver.__repr__` was
hard-coded. This meant that subclasses needed to reimplement their own
`__repr__`; otherwise, they'd appear as this parent class in debugging
output like that from print_run_info().

This also has the nice side effect of fixing a typo (`resolver_thread`
to `resolver.thread`).

Just based on https://github.com/ionelmc/python-tblib/commit/a96352760d20bedb881dd592fd342a732a36ec4b

Use CodeType.replace() if available

Port _tblib.Traceback to Python 3.8: use code.replace() method if
available.