exclude IPython.lib.kernel in iptest

when pyzmq is unavailable

IPython/testing/iptest.py

@@ -272,6 +272,7 b' def make_exclude():'
                            ])
 
     if not have['zmq']:
+        exclusions.append(ipjoin('lib', 'kernel'))
         exclusions.append(ipjoin('kernel'))
         exclusions.append(ipjoin('qt'))
         exclusions.append(ipjoin('html'))