re-enable cluster test

Author: kristjanvalur

tests/test_asyncio/test_cwe_404.py

@@ -128,7 +128,6 @@ async def op(r):
                 assert await r.get("foo") == b"foo"
 
 
-@pytest.mark.xfail(reason="cancel does not cause disconnect")
 @pytest.mark.onlynoncluster
 @pytest.mark.parametrize("delay", argvalues=[0.05, 0.5, 1, 2])
 async def test_standalone_pipeline(delay, master_host):