It was seen in [1] and some other occassions, possibly neutron was trying
to fetch token while keystone was being upgraded.

[1]: https://storage.bhs.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_ec2/665117/12/check/kolla-ansible-ubuntu-source-upgrade/ec2fc04/primary/logs/kolla/all-CRITICAL.txt

Change-Id: If8c569e1f7815520c84627671e3cbf275bed8ff9