Upgrade jsoncpp to 1.9.4

Bug: 170642246
Change-Id: Id1fae5a1b6421117f923c616718ee4b3571231e0
diff --git a/test/cleantests.py b/test/cleantests.py
index c38fd8f..36d5b9b 100644
--- a/test/cleantests.py
+++ b/test/cleantests.py
@@ -1,10 +1,16 @@
-# removes all files created during testing
+# Copyright 2007 Baptiste Lepilleur and The JsonCpp Authors
+# Distributed under MIT license, or public domain if desired and
+# recognized in your jurisdiction.
+# See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
+
+"""Removes all files created during testing."""
+
 import glob
 import os
 
 paths = []
 for pattern in [ '*.actual', '*.actual-rewrite', '*.rewrite', '*.process-output' ]:
-    paths += glob.glob( 'data/' + pattern )
+    paths += glob.glob('data/' + pattern)
 
 for path in paths:
-    os.unlink( path )
+    os.unlink(path)