'Retrieves the tags for a resource.
For more information, please refer to the official API reference:
http://developer.openstack.org/api-ref/networking/v2/index.html#obtain-tag-list'

def list_tags(self, resource_type, resource_id):

    uri = ('/%s/%s/tags' % (resource_type, resource_id))
    return self.list_resources(uri)
