@abc.abstractmethod
    def prepare_port_filter(self, port):
If there are no Manifestations on this node, then
dataset/ETHPy150Open openstack/neutron/neutron/agent/firewall.py/FirewallDriver.prepare_port_filter--crossover with--dataset/ETHPy150Open ClusterHQ/flocker/flocker/node/agents/test/test_blockdevice.py/CalculateDesiredStateTests.test_no_manifestations