Issue #20896: Workaround the bug temporarely to fix buildbots
Backed out changeset c13398566409
use support.rmtree instead of shutil (closes #19614)

Patch by Sean Rodman.
merge 3.3 (#19614)
add Sean Rodman
merge 3.3
use ssl.PROTOCOL_SSLv23 for maximum compatibility (closes #20896)
merge 3.2 (#20896)
merge 3.3 (#20896)
Fix note markup (#16805).

Patch by Tshepang Lekhonkhobe, reviewed by Georg Brandl.
Merge 3.3 (#16805)
remove unnecessary word (closes #19060)

Patch by Anastasia Filatova.
merge 3.3 (#19060)
weaken callback count inequality (closes #20901)
merge 3.3 (#20901)