Fix magmagw: race condition when orch not ready yet

            orch_ip = event.params["orch_ip"]

            orch_net = event.params["orch_net"]

            proxy = self.get_ssh_proxy()

            attempt = 0

            while attempt < 50:

                try:

                    stdout, stderr = proxy.run(

                        "/home/magma/addnet.py --orch_ip {} --orch_net {}".format(

                            orch_ip, orch_net

                        )

                    )

                    break

                except subprocess.CalledProcessError:

                    attempt += 1

                    import time

                    time.sleep(5)

            event.set_results({"output": stdout, "stderr": stderr})

        else:

            event.fail("Unit is not leader")