Comment out test that can't run on all machines successfully

tests/test_client.py

@@ -30,9 +30,12 @@ def test_client(client_app=None):
     req = Request.blank('http://localhost:1')
     resp = req.send(client_app)
     assert resp.status_code == 502, resp.status
-    req = Request.blank('http://laksjdfkajwoeifknslkasdflkjasdflaksjdf.eu')
-    resp = req.send(client_app)
-    assert resp.status_code == 502, resp.status
+    ## This reasonable and valid test doesn't work on some machines, where invalid DNS
+    ## requests are intercepted by ISPs and turned into succeeding requests.
+    if False:
+        req = Request.blank('http://laksjdfkajwoeifknslkasdflkjasdflaksjdf.eu')
+        resp = req.send(client_app)
+        assert resp.status_code == 502, resp.status
 
 
 @wsgify