Accept objects in name_or_id parameter

Let's not tell anybody about it, but if someone passes us an object
in the name_or_id slot, let's roll with it.

Change-Id: I70ea91c948c0f82185861baa22830a4954359b6f

shade/_utils.py

@@ -125,6 +125,9 @@ def _get_entity(func, name_or_id, filters):
     :param dict filters:
         A dictionary of meta data to use for further filtering.
     """
+    # We've been passed a dict/object already, return it
+    if hasattr(name_or_id, 'id'):
+        return name_or_id
     entities = func(name_or_id, filters)
     if not entities:
         return None