Fix the logging in spood (#1420)
Fix the logging in spood (#1420)

Currently we're getting:
```
Retrying [http://activator-with-cc.default.svc.cluster.local?sleep=100 retrying for DNS error: Get http://activator-with-cc.default.svc.cluster.local?sleep=100: dial tcp: lookup activator-with-cc.default.svc.cluster.local on 10.27.240.10:53: no such host]: %vim test/spoof/spoof.go (MISSING)
```
Which is not cool. So fix it to report proper string.
URL is known to be non-nil here.
knative/pkg,knative/pkg