eventing: When the data plane can't reach the apiserver, it silently fails to forward

Describe the bug In a non-default namespace, the default-broker-filter deployment fails to actually load any Trigger data, and instead reports:

sigs.k8s.io/controller-runtime/pkg/cache/internal/informers_map.go:126: Failed to list *v1alpha1.Trigger: Get https://10.15.240.1:443/apis/eventing.knative.dev/v1alpha1/namespaces/demo/triggers?limit=500&resourceVersion=0: net/http: TLS handshake timeout

and

jsonPayload: {
  caller:  "filter/main.go:52"   
  error:  "Get https://10.15.240.1:443/api?timeout=32s: dial tcp 10.15.240.1:443: connect: connection refused"   
  level:  "fatal"   
  logger:  "provisioner"   
  msg:  "Error starting up."   
  stacktrace:  "main.main
	/go/src/github.com/knative/eventing/cmd/broker/filter/main.go:52
runtime.main
	/usr/local/go/src/runtime/proc.go:200"   
  ts:  "2019-04-18T22:36:24.188Z"   
 }

Expected behavior Broker and Trigger work in a namespace other than the default namespace.

To Reproduce Deploy Broker/Trigger to a non-default namespace and then attempt to deliver via Trigger.

Knative release version Release 0.5