Comment 1 for bug 1996966

This ran a bell for me, so I went digging, and found [1]. I'm not sure we can make get_machine_ips() take less time with a reasonable amount of error (some sort of parallelism or scatter/gather type thing seems like overkill here), but we can probably make the _check_my_ip() check at libvirt startup optional and configurable, since it only prints a warning.

[1] https://review.opendev.org/c/openstack/nova/+/671471