Disable the unit test ofdetection output op

Author: reyoung

python/paddle/v2/fluid/tests/test_detection_output_op.py

@@ -68,4 +68,6 @@ def init_test_case(self):
 
 
 if __name__ == '__main__':
-    unittest.main()
+    # FIXME: detection_output_op will be rewritten. This unittest should be
+    # enabled after rewriting.
+    exit(0)  # temporary disable this unittest