Add a name for the port (#1437)
Add a name for the port (#1437)

W/o this istio complains:
```
Info [IST0118] (Service kafka-source-webhook.knative-sources) Port name  (port: 443, targetPort: 8443) doesn't follow the naming convention of Istio port.
```

Signed-off-by: Doug Davis <ff3bde741799c0eff815b83a54eda3fc494df54f@us.ibm.com>
knative-sandbox/eventing-ceph,knative-sandbox/eventing-camel,knative/eventing-contrib,knative-sandbox/eventing-gitlab,knative-sandbox/eventing-prometheus,knative-sandbox/eventing-awssqs,knative-sandbox/eventing-natss,knative-sandbox/eventing-natss,knative-sandbox/eventing-github,knative-sandbox/eventing-kafka,knative-sandbox/eventing-gitlab,knative-sandbox/eventing-camel,knative-sandbox/eventing-prometheus,knative-sandbox/eventing-ceph,knative/eventing-contrib,knative-sandbox/eventing-kafka,knative-sandbox/eventing-github,knative-sandbox/eventing-awssqs,knative-sandbox/eventing-couchdb,knative-sandbox/eventing-couchdb