Fix an absurdly invasive test.
Fix an absurdly invasive test.

Checks that an io object somewhere in the stack of wrappers is
actually closed.  --This line, and those below, will be ignored--

M    test_urllib2net.py

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator