optimization: Remove needless json.loads from middleware

This patchset removes a needless json.loads from middleware
which only adds needless overhead to Deckhand.

Change-Id: I0e2a329c25198e80b42ca8b821baf6032509eec7

deckhand/control/middleware.py

@@ -17,7 +17,6 @@ import yaml
 import falcon
 from oslo_config import cfg
 from oslo_log import log as logging
-from oslo_serialization import jsonutils as json
 import six
 
 import deckhand.context
@@ -170,11 +169,6 @@ class YAMLTranslator(HookableMiddlewareMixin, object):
 
             resp_attr = getattr(resp, attr)
 
-            try:
-                resp_attr = json.loads(resp_attr)
-            except (TypeError, ValueError):
-                pass
-
             if isinstance(resp_attr, dict):
                 setattr(resp, attr, yaml.safe_dump(resp_attr))
             elif isinstance(resp_attr, (list, tuple)):