Fix unit test regarding recent changes in node_info RPC

This fixes a unit test in instance_storage_unittest.py,
which was affected by the recent change in the RCP
'node_info'.
Signed-off-by: Helga Velroyen <helgav@google.com>
Reviewed-by: Hrovje Ribicic <riba@google.com>

test/py/cmdlib/instance_storage_unittest.py

@@ -73,7 +73,8 @@ class TestCheckNodesFreeDiskOnVG(unittest.TestCase):
   def testPerformNodeInfoCall(self):
     expected_hv_arg = [(self.hvname, self.hvparams)]
     expected_storage_arg = {self.node_uuid:
-        [(constants.ST_LVM_VG, self.vg, [self.es])]}
+        [(constants.ST_LVM_VG, self.vg, [self.es]),
+         (constants.ST_LVM_PV, self.vg, [self.es])]}
     instance_storage._PerformNodeInfoCall(self.lu, self.node_uuids, self.vg)
     self.lu.rpc.call_node_info.assert_called_with(
         self.node_uuids, expected_storage_arg, expected_hv_arg)