Fix incomplete sentence in asyncio docs.
Issue #20055: Fix BaseEventLoop.stop() docstring, incomplete sentence.
Patch written by Saimadhav Heblikar.
asyncio tests: relax timings for slow buildbots
test_gettext: use support.rmtree() instead of shutil.rmtree()
Issue #19884: readline: Disable the meta modifier key if stdout is not a
terminal to not write the ANSI sequence "\033[1034h" into stdout. This sequence
is used on some terminal (ex: TERM=xterm-256color") to enable support of 8 bit
characters.
Issue #21813: Enhance documentation of the os.stat_result class.
Backport os.rst documentation from Python 3.5.