'List the services
:param cluster: The cluster hosting the services
:type  cluster: :class:`libcloud.container.base.ContainerCluster`
:rtype: ``list`` of ``str``'

def ex_list_service_arns(self, cluster=None):

    request = {}
    if (cluster is not None):
        request['cluster'] = cluster.id
    response = self.connection.request(ROOT, method='POST', data=json.dumps(request), headers=self._get_headers('ListServices')).object
    return response['serviceArns']
