component/trafficserver: do not return stale negative cache.

https://github.com/apache/trafficserver/issues/7417#issuecomment-757866872
7 jobs for cmf_upgrade_versions in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.SlapRunner.ResilienceTest-Master

00:26:12

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:24:23

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

03:46:17

passed SlapOS.SlapRunner.ResilienceTest-Master

00:26:03

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:27:38

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:29:29

passed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

02:56:29