Parse the service catalog returned by the Identity API for an endpoint matching
        the Nova service with the requested version
        Sends a CRITICAL service check when no viable candidates are found in the Catalog

def _get_nova_endpoint(cls, json_resp):
        """
        Parse the service catalog returned by the Identity API for an endpoint matching
        the Nova service with the requested version
        Sends a CRITICAL service check when no viable candidates are found in the Catalog
        """
        valid_endpoint = cls._get_valid_endpoint(json_resp, 'nova', 'compute')
        if valid_endpoint:
            return valid_endpoint
        raise MissingNovaEndpoint()