Dialing down gerrit auth noise: log only when cookiefile changed
Dialing down gerrit auth noise: log only when cookiefile changed

This is now very flaky, logs every couple of seconds

BenTheElder/test-infra,cjwagner/test-infra,cblecker/test-infra,michelle192837/test-infra,jessfraz/test-infra,michelle192837/test-infra,dims/test-infra,jessfraz/test-infra,cjwagner/test-infra,kubernetes/test-infra,cjwagner/test-infra,dims/test-infra,jessfraz/test-infra,michelle192837/test-infra,kubernetes/test-infra,michelle192837/test-infra,cjwagner/test-infra,BenTheElder/test-infra,dims/test-infra,BenTheElder/test-infra,dims/test-infra,kubernetes/test-infra,cblecker/test-infra,jessfraz/test-infra,jessfraz/test-infra,kubernetes/test-infra,kubernetes/test-infra,dims/test-infra,cblecker/test-infra,kubernetes/test-infra,BenTheElder/test-infra,cblecker/test-infra,michelle192837/test-infra,BenTheElder/test-infra,BenTheElder/test-infra,cjwagner/test-infra,cblecker/test-infra,michelle192837/test-infra,jessfraz/test-infra,cblecker/test-infra,cjwagner/test-infra,dims/test-infra