reset use_pickle more reliably

xfail tests still run! So engines were being left in `use_cloudpickle` state

Author: minrk

ipyparallel/tests/clienttest.py

@@ -167,6 +167,8 @@ def setUp(self):
         self.engines = []
 
     def tearDown(self):
+        self.client[:].use_pickle()
+
         # self.client.clear(block=True)
         # close fds:
         for e in filter(lambda e: e.poll() is not None, launchers):

ipyparallel/tests/test_joblib.py

@@ -36,8 +36,6 @@ def test_default_backend(self):
             p = Parallel(backend='ipyparallel')
             assert p._backend._view.client is self.client
 
-        self.client[:].use_pickle()
-
     def test_register_backend(self):
         view = self.client.load_balanced_view()
         view.register_joblib_backend('view')