Fix test_version to match reality.

theano/sandbox/cuda/tests/test_dnn.py

@@ -197,4 +197,4 @@ def test_dnn_tag():
 def test_version():
     if not cuda.dnn.dnn_available():
         raise SkipTest(cuda.dnn.dnn_available.msg)
-    assert isinstance(cuda.dnn.version(), int)
+    assert isinstance(cuda.dnn.version(), (int, tuple))