Unable to update app name

Create an app with name testapp and then try to update it.

curl -X PUT -d '{"app": {"name": "newapp"}}' localhost:8080/v1/apps/testapp

As response i get:

{"message":"App successfully updated","app":{"name":"testapp","config":null}}

And when i’m trying to list apps i get:

{"message":"Successfully listed applications","apps":[{"name":"testapp","config":null}]}

It appears that app name is immutable. So in order to fix it, following changes required:

update docs to reflect immutability of an app name
at API level return HTTP 403 with error message saying that app name is immutable
update swagger doc to reflect real use case for HTTP PUT

In swagger there's an example:

{
  "app": {
    "name": "string",
    "config": {}
  }
}

But it doesn't have any effect, would be nice to have more useful example.

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