Remove tests for checking DNS resolution

The tests checking the DNS resolution aren't reliable as they rely on specific
behavior of the DNS resolution on the local system. As they are reliable it
makes no sense to keep them as they are currently.

binder/tests/testHelpers.py

@@ -1,12 +0,0 @@
-from django.test import TestCase
-
-from binder import models, helpers
-
-class HelperTests(TestCase):
-    def test_ipinfo_ResolutionFail(self):
-        response = helpers.ip_info("foobar.doesnotexist.local")
-        self.assertEqual([['Error', u'Unable to resolve foobar.doesnotexist.local: [Errno -2] Name or service not known']],
-                         response)
-        response = helpers.ip_info("localhost")
-        self.assertEqual([['IPv4 (1)', u'127.0.0.1']],
-                         sorted(response))