librarian.txt causes spurious failure with wildcard DNS

When the test suite is run on systems with wildcard DNS (such as OpenDNS), the following failure is emitted:

Failed example:
    print restricted_file.read()
Differences (ndiff with -expected +actual):
      Traceback (most recent call last):
    - ...
    - URLError: <urlopen error (-2, 'Name or service not known')>
    + File "/home/abentley/launchpad/merge-directive-bundles/utilities/../lib/zope/testing/doctest.py", line 1360, in __run
    + compileflags, 1) in test.globs
    + File "<doctest librarian.txt[173]>", line 1, in ?
    + print restricted_file.read()
    + File "/home/abentley/launchpad/wildcard-dns-failure/lib/canonical/launchpad/database/librarian.py", line 108, in read
    + self.open()
    + File "/home/abentley/launchpad/wildcard-dns-failure/lib/canonical/launchpad/database/librarian.py", line 97, in open
    + self._datafile = self.client.getFileByAlias(self.id)
    + File "/home/abentley/launchpad/wildcard-dns-failure/lib/canonical/librarian/client.py", line 328, in getFileByAlias
    + return _File(urllib2.urlopen(url))
    + File "/usr/lib/python2.4/urllib2.py", line 130, in urlopen
    + return _opener.open(url, data)
    + File "/usr/lib/python2.4/urllib2.py", line 358, in open
    + response = self._open(req, data)
    + File "/usr/lib/python2.4/urllib2.py", line 376, in _open
    + '_open', req)
    + File "/usr/lib/python2.4/urllib2.py", line 337, in _call_chain
    + result = func(*args)
    + File "/usr/lib/python2.4/urllib2.py", line 1021, in http_open
    + return self.do_open(httplib.HTTPConnection, req)
    + File "/usr/lib/python2.4/urllib2.py", line 996, in do_open
    + raise URLError(err)
    + URLError: <urlopen error (110, 'Connection timed out')>

This is because wildcard DNS causes a different failure from the expected one.
I am preparing a branch which comments out this line.