Fix parallel tests to work with new magic API.

IPython/parallel/client/view.py

@@ -813,10 +813,10 b' class DirectView(View):'
         except NameError:
             print "The IPython parallel magics (%result, %px, %autopx) only work within IPython."
         else:
-            pmagic = ip.plugin_manager.get_plugin('parallelmagic')
+            pmagic = ip.magics_manager.registry.get('ParallelMagics')
             if pmagic is None:
                 ip.magic('load_ext parallelmagic')
-                pmagic = ip.plugin_manager.get_plugin('parallelmagic')
+                pmagic = ip.magics_manager.registry.get('ParallelMagics')
 
             pmagic.active_view = self