Setup headers for authentication request.

def get_headers(self):
        """Setup headers for authentication request."""

        try:
            return {
                'X-Auth-User': self.job_args['os_user'],
                'X-Auth-Key': self.job_args['os_apikey']
            }
        except KeyError as exp:
            raise exceptions.AuthenticationProblem(
                'Missing Credentials. Error: %s',
                exp
            )