Call shutdown() of msg network modules @ shutdown

core/bbs.js

@@ -100,10 +100,15 @@ function shutdownSystem() {
 			},
 			function stopEventScheduler(callback) {
 				if(initServices.eventScheduler) {
-					return initServices.eventScheduler.shutdown(callback);
+					return initServices.eventScheduler.shutdown( () => {
+						callback(null);	// ignore err
+					});
 				} else {
 					return callback(null);
 				}
+			},
+			function stopMsgNetwork(callback) {
+				require('./msg_network.js').shutdown(callback);
 			} 
 		],
 		() => {

core/msg_network.js

@@ -7,7 +7,7 @@ let loadModulesForCategory	= require('./module_util.js').loadModulesForCategory;
 //	standard/deps
 let async				= require('async');
 
-exports.startup			= startup
+exports.startup			= startup;
 exports.shutdown		= shutdown;
 exports.recordMessage	= recordMessage;
 
@@ -36,12 +36,19 @@ function startup(cb) {
 	);
 }
 
-function shutdown() {
-	msgNetworkModules.forEach(mod => {
-		mod.shutdown();
+function shutdown(cb) {
+	async.each(
+		msgNetworkModules, 
+		(msgNetModule, next) => {
+			msgNetModule.shutdown( () => {
+				return next();
 			});
-
+		}, 
+		() => {
 			msgNetworkModules = [];
+			return cb(null);
+		}
+	);	
 }
 
 function recordMessage(message, cb) {