Moving metro-net to vnaas and porting to 4.0

Change-Id: Id42bb247033087e5d28bcbab9db07d58e6364625
(cherry picked from commit 95c02bd391ad5eb8edeba00e81b851b97a6abbd1)
diff --git a/xos/gui/conf/gulp.conf.js b/xos/gui/conf/gulp.conf.js
new file mode 100755
index 0000000..f5e4f2a
--- /dev/null
+++ b/xos/gui/conf/gulp.conf.js
@@ -0,0 +1,56 @@
+
+/*
+ * Copyright 2017-present Open Networking Foundation
+
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+
+ * http://www.apache.org/licenses/LICENSE-2.0
+
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+'use strict';
+
+const path = require('path');
+const gutil = require('gulp-util');
+
+exports.ngModule = 'app';
+
+exports.paths = {
+  src: 'src',
+  dist: 'dist/extensions/vnaasgui',
+  appConfig: 'conf/app',
+  tmp: '.tmp',
+  e2e: 'e2e',
+  tasks: 'gulp_tasks'
+
+};
+
+exports.path = {};
+for (const pathName in exports.paths) {
+  if (exports.paths.hasOwnProperty(pathName)) {
+    exports.path[pathName] = function pathJoin() {
+      const pathValue = exports.paths[pathName];
+      const funcArgs = Array.prototype.slice.call(arguments);
+      const joinArgs = [pathValue].concat(funcArgs);
+      return path.join.apply(this, joinArgs);
+    };
+  }
+}
+
+/**
+ *  Common implementation for an error handler of a Gulp plugin
+ */
+exports.errorHandler = function (title) {
+  return function (err) {
+    gutil.log(gutil.colors.red(`[${title}]`), err.toString());
+    this.emit('end');
+  };
+};