'Don\'t start any nodes.  Give back the addresses of the configured,
already-started nodes.'

def start_cluster(self, reactor):

    if (self.package_source is not None):
        upgrading = self._upgrade_flocker(reactor, self._nodes, self.package_source)
    else:
        upgrading = succeed(None)
    def configure(ignored):
        return configured_cluster_for_nodes(reactor, generate_certificates(self.identity.name, self.identity.id, self._nodes, self.cert_path), self._nodes, self.dataset_backend, self.dataset_backend_configuration, save_backend_configuration(self.dataset_backend, self.dataset_backend_configuration), provider='managed', logging_config=self.logging_config)
    configuring = upgrading.addCallback(configure)
    return configuring
