Comment 40 for bug 1403152

Additional Experiments:
- No NAT, lxc bridges to VM eth0, which is bridged to host machine br0
 Still fails
- Let timeout on unregister_notifier keep going
 Still running after an hour, can't create new containers (original issue)
 sudo conntrack -{L,F} hangs...
- Purge conntrack flowtable on host right before unmount
 Still fails
- Look at conntrack table on host when its stuck
 Had issues with this because of hang

Next steps:
- Track down TCP connection that's being held open