Fix HTTP listener test & benchmarks

The interaction of the last two PRs resulted in the HTTP listener
tests and benchmarks being broken. This change fixes that as well as
suppressing log output during the HTTP listener benchmarks.

listener/listener_medium_test.go

@@ -303,6 +303,9 @@ func TestHTTPListenerConcurrency(t *testing.T) {
 }
 
 func TestHTTPListenerWithPrecision(t *testing.T) {
+	s := spouttest.RunGnatsd(natsPort)
+	defer s.Shutdown()
+
 	conf := testConfig()
 	listener := startHTTPListener(t, conf)
 	defer listener.Stop()
@@ -364,6 +367,12 @@ func BenchmarkListenerLatency(b *testing.B) {
 }
 
 func BenchmarkHTTPListener(b *testing.B) {
+	spouttest.SuppressLogs()
+	defer spouttest.RestoreLogs()
+
+	s := spouttest.RunGnatsd(natsPort)
+	defer s.Shutdown()
+
 	listener := startHTTPListener(b, testConfig())
 	defer listener.Stop()
 
@@ -384,6 +393,12 @@ func BenchmarkHTTPListener(b *testing.B) {
 }
 
 func BenchmarkHTTPListenerWithPrecision(b *testing.B) {
+	spouttest.SuppressLogs()
+	defer spouttest.RestoreLogs()
+
+	s := spouttest.RunGnatsd(natsPort)
+	defer s.Shutdown()
+
 	listener := startHTTPListener(b, testConfig())
 	defer listener.Stop()