[2.7] bpo-34836: fix test_default_ecdh_curve, needs no tlsv1.3.

[xnox]

https://bugs.python.org/issue34836

https://bugs.python.org/issue34836

[the-knights-who-say-ni]

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[tiran]

The patch looks good to me. Please include a news entry.

[xnox]

@tiran added a NEWS entry, hopefully correctly.

[xnox]

What can I do to get this reviewed / merged? I do not understand the current state of this PR.

[encukou]

I changed the title to make the bot happy.
But an SSL expert (like @tiran) should merge this. I'm not brave enough to do it.

[ncoghlan]

@tiran already reviewed the test change above, it was just pending the NEWS entry.