Option compute_test_value should not be in C key

theano/configdefaults.py

@@ -229,4 +229,5 @@ AddConfigVar('warn.sum_div_dimshuffle_bug',
 
 AddConfigVar('compute_test_value',
         "If 'True', Theano will run each op at graph build time, using Constants, SharedVariables and the tag 'test_value' as inputs to the function. This helps the user track down problems in the graph before it gets optimized.",
-        EnumStr('False', 'True', 'warn', 'err'))
+        EnumStr('False', 'True', 'warn', 'err'),
+        in_c_key=False)