Comment 2 for bug 1669528

Actually I think it goes back further than 3/2. Ihar pointed this out in IRC:

https://review.openstack.org/#/c/423581/6

From looking at the logstash results, it shows up a lot in successful runs too so it's probably not causing failures, but it shows up in a lot of the runs so there is a problem to be solved with updating/deleting ports.