Moved ping to its own controller

re: #6281

src/controllers/ping.js

@@ -0,0 +1,15 @@
+'use strict';
+
+var async = require('async');
+var db = require('../database');
+
+module.exports.ping = function (req, res, next) {
+	async.waterfall([
+		function (next) {
+			db.getObject('config', next);
+		},
+		function () {
+			res.status(200).send(req.path === '/sping' ? 'healthy' : '200');
+		},
+	], next);
+};