[issue30759] [2.7] Fix python2 -m test --list-cases test_multibytecodec_support test_robotparser

[STINNER Victor]

STINNER Victor added the comment:

Well, this issue is not about discovering all test methods, but just to not
fail with an error on: ./python -m test --list-cases

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30759>
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