changed LOG Error to Warning when object search fails

Treating search failure as warning and returning None in infoblox client,
as plugin using the infoblox_client can LOG based on its requirement.

Author: Akash Deep

infoblox_client/connector.py

@@ -319,7 +319,7 @@ def _get_object(self, obj_type, url):
         self._validate_authorized(r)
 
         if r.status_code != requests.codes.ok:
-            LOG.error("Error occurred on object search: %s", r.content)
+            LOG.warning("Failed on object search with url %s: %s", url, r.content)
             return None
         return self._parse_reply(r)