move two functions next to the functions that use them.

- Python issue 21163: Fix more "Task was destroyed but it is pending!" logs in
  tests
- Add test to check that run_until_complete() checks the loop of the future

- Uniformize repr() output to format "<Class ...>"
- On Python 3.5+, repr(Task) uses the qualified name instead of the short name
  of the coroutine

files closing.  Patch by Claudiu Popa.

Specifically, it was relying a URL which gave HTTP 403 and used it to assert
it's methods, this changes undoes that and provides a local http server with
similar properties.

Patch contributed by Vajrasky Kok.

parameters on encodestring and decodestring.

Patch by Petri Lehtinen.

Issue #19145:  Fix handling of negative values for a "times" keyword argument to itertools.repeat()>

(Patch contributed by Vajrasky Kok.)

fit in the default width of the text window (45 chars).

done: use the first line number of the code object instead of the current line
number of the generator frame.

The name of the coroutine is not enough because many coroutines may have the
same name. It's a common case in asyncio tests for example.

Windows was seeing the 'GET' generated by these tests as invalid and forcibly
closing the socket, causing the test to fail.

Patch by Jeff Allen.

(Based on a patch from Renee Chu.)

Closes #21801.

raises an exception if there is no current loop

Patch from Yayoi Ukai.

From the combined efforts of Berber Peksage, Andrew Svetlov, and Yayoi Ukai.

event loop is running. You must first stop the event loop and then wait until
it stopped, before closing it.

enables debug mode of the event loop.

environment variable is set

exception if the current loop is not None.

Guido van Rossum wrote:

"The behavior that you can set the loop to None (and keep track of it
explicitly) is part of the spec, and this should still be supported even in
debug mode. The behavior that we raise an error if you are caught having
multiple active loops per thread is just a debugging heuristic, and it
shouldn't break code that follows the spec."