Use common controller/store for httpTriggerSet and functionReferenceResolver (#390)

This fixes a bug where functionReferenceResolver returned out-of-date function metadata and caused the router to proxy requests to old function pods.

It also uses the go context package to shutdown the controller when the router is shutting down.

router/router_test.go

@@ -17,6 +17,7 @@ limitations under the License.
 package router
 
 import (
+	"context"
 	"fmt"
 	"testing"
 	"time"
@@ -58,7 +59,7 @@ func TestRouter(t *testing.T) {
 	frr.refCache.Set(nfr, rr)
 
 	// HTTP trigger set with a trigger for this function
-	triggers := makeHTTPTriggerSet(fmap, nil, nil, frr, nil)
+	triggers, _, _ := makeHTTPTriggerSet(fmap, nil, nil, nil)
 	triggerUrl := "/foo"
 	triggers.triggers = append(triggers.triggers,
 		crd.HTTPTrigger{
@@ -75,7 +76,9 @@ func TestRouter(t *testing.T) {
 
 	// run the router
 	port := 4242
-	go serve(port, triggers)
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	go serve(ctx, port, triggers, frr)
 	time.Sleep(100 * time.Millisecond)
 
 	// hit the router