Filter resource-types by support status

When querying the api for resource types, the user should be able to filter the results by support status

So, the workflow would be:

1. Add the ability to querying for all existing resource types to python-heatclient and to filtering it by status.
2. In heat api 'list_resource_types' function is already implemented. We want this function to return dictionary like {'resource_type' : 'support_status'}