Comment 6 for bug 2015090

I think I found the root cause. This piece of code returns a True/False instead of a device name[0], this is expected to be executed only when there are network segments defined, although in this testing environment there aren't, I'm collecting more information to understand and confirm if this assumption is correct.

The code in question was merged in this review https://review.opendev.org/c/openstack/neutron/+/840421

[0] https://opendev.org/openstack/neutron/src/tag/22.0.0/neutron/agent/dhcp/agent.py#L219-L234