normalize the json output of show a given extension.

we should use {'extension':{}} for a given extension query to comply with
our API design.

Change-Id: Id0b04b29bed4be92498c04178e268c31e9a1d635

quantum/extensions/extensions.py

@@ -221,7 +221,7 @@ class ExtensionController(wsgi.Controller):
         if not ext:
             raise webob.exc.HTTPNotFound(
                 _("Extension with alias %s does not exist") % id)
-        return self._translate(ext)
+        return dict(extension=self._translate(ext))
 
     def delete(self, request, id):
         raise webob.exc.HTTPNotFound()

quantum/tests/unit/test_extensions.py

@@ -454,7 +454,7 @@ class ExtensionControllerTest(unittest.TestCase):
 
     def test_extension_can_be_accessed_by_alias(self):
         foxnsox_extension = self.test_app.get("/extensions/FOXNSOX").json
-
+        foxnsox_extension = foxnsox_extension['extension']
         self.assertEqual(foxnsox_extension["alias"], "FOXNSOX")
         self.assertEqual(foxnsox_extension["namespace"],
                          "http://www.fox.in.socks/api/ext/pie/v1.0")