Add clustering to config reload tests

server/configs/reload/reload.conf

@@ -20,3 +20,8 @@ authorization {
     password: T0pS3cr3t
     timeout:  2
 }
+
+cluster {
+    listen:       localhost:-1
+    no_advertise: true # enable on reload
+}

server/configs/reload/test.conf

@@ -5,3 +5,8 @@ debug:   false
 trace:   false
 logtime: false
 log_file: "/tmp/gnatsd.log"
+
+cluster {
+    listen:       localhost:-1
+    no_advertise: false
+}

server/reload_test.go

@@ -48,6 +48,10 @@ func TestConfigReloadUnsupported(t *testing.T) {
 		PingInterval:   2 * time.Minute,
 		MaxPingsOut:    2,
 		WriteDeadline:  2 * time.Second,
+		Cluster: ClusterOpts{
+			Host: "localhost",
+			Port: -1,
+		},
 	}
 	processOptions(golden)
 
@@ -109,6 +113,10 @@ func TestConfigReloadInvalidConfig(t *testing.T) {
 		PingInterval:   2 * time.Minute,
 		MaxPingsOut:    2,
 		WriteDeadline:  2 * time.Second,
+		Cluster: ClusterOpts{
+			Host: "localhost",
+			Port: -1,
+		},
 	}
 	processOptions(golden)
 
@@ -170,6 +178,10 @@ func TestConfigReload(t *testing.T) {
 		PingInterval:   2 * time.Minute,
 		MaxPingsOut:    2,
 		WriteDeadline:  2 * time.Second,
+		Cluster: ClusterOpts{
+			Host: "localhost",
+			Port: -1,
+		},
 	}
 	processOptions(golden)
 
@@ -229,6 +241,9 @@ func TestConfigReload(t *testing.T) {
 	if !server.info.AuthRequired {
 		t.Fatal("Expected AuthRequired to be true")
 	}
+	if !updated.Cluster.NoAdvertise {
+		t.Fatal("Expected NoAdvertise to be true")
+	}
 }
 
 // Ensure Reload supports TLS config changes. Test this by starting a server