Comment 3 for bug 1642537

Don't really see this in nova logs in upstream CI anymore:

http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22Deadlock%20found%20when%20trying%20to%20get%20lock%3B%20try%20restarting%20transaction'%5C%22&from=7d

^ are hitting in neutron. But I have heard operators say they hit migration_update deadlocks downstream so it's still probably worth putting a retry decorator on that method.