def instance_filter_exists(self, instance, network_info):
        return self.nwfilter.instance_filter_exists(instance, network_info)
L{Server.writeSequence} discards bytes passed to it if called after it
dataset/ETHPy150Open nii-cloud/dodai-compute/nova/virt/libvirt/firewall.py/IptablesFirewallDriver.instance_filter_exists--crossover with--dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/internet/test/test_tcp.py/TCPServerTests.test_writeSequenceAfteDisconnectAfterTLS