Use yaml.safe_dump rather than yaml.dump. No more "!!python/unicode".

lib/ansible/runner/filter_plugins/core.py

@@ -25,7 +25,7 @@ class FilterModule(object):
         return {
             'to_json': json.dumps,
             'from_json': json.loads,
-            'to_yaml': yaml.dump,
+            'to_yaml': yaml.safe_dump,
             'from_yaml': yaml.load,
         }