[issue20668] Remove dependency on tests.txt when running test_asyncio suite

[Yury Selivanov]

Yury Selivanov added the comment:

> Please wait until after 3.4 release. Not critical.
I'll assign this to myself to commit this after 3.4.

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assignee:  -> yselivanov

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20668>
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