remove HTTPSConnection's check_hostname parameter (#22959)

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branch : 2.7
merge 2.7.9 release branch

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branch : 2.7
restore test data README

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branch : 2.7
merge 2.7.9 release branch

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branch : 2.7
remove mention of check_hostname parameter

--HG--
branch : 2.7
Merge 2.7.9 release branch

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branch : 2.7