ssh fails in tempest runs when guest dhcp lease fails

I saw this here (and I've seen it before but couldn't find an existing bug):

https://storage.bhs1.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_340/674243/32/gate/tempest-slow-py3/3404414/testr_results.html.gz

Starting network...
udhcpc (v1.23.2) started
Sending discover...
Sending discover...
Sending discover...
Usage: /sbin/cirros-dhcpc <up|down>
No lease, failing
WARN: /etc/rc3.d/S40-network failed
checking http://169.254.169.254/2009-04-04/instance-id
failed 1/20: up 200.04. request failed
failed 2/20: up 202.77. request failed

http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22No%20lease%2C%20failing%5C%22%20AND%20tags%3A%5C%22console%5C%22&from=7d

45 hits in 7 days, check and gate, all failures.