[issue20753] disable test_robotparser test that uses an invalid URL

[Roundup Robot]

Roundup Robot added the comment:

New changeset 0e08ca451b34 by Berker Peksag in branch '3.4':
Issue #20753: Skip PasswordProtectedSiteTestCase when Python is built without threads.
http://hg.python.org/cpython/rev/0e08ca451b34

New changeset 394e6bda5a70 by Berker Peksag in branch 'default':
Issue #20753: Merge with 3.4.
http://hg.python.org/cpython/rev/394e6bda5a70

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