[issue20753] disable test_robotparser test that uses an invalid URL

[Roundup Robot]

Roundup Robot added the comment:

New changeset 16d8240ff841 by Senthil Kumaran in branch '3.4':
issue20753 - robotparser tests should not rely upon external resource when not required.
http://hg.python.org/cpython/rev/16d8240ff841

New changeset 74cd8abcc302 by Senthil Kumaran in branch 'default':
merge from 3.4
http://hg.python.org/cpython/rev/74cd8abcc302

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nosy: +python-dev

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