Add Echo backend

test/backend/echo/README.md

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+# Simple echo server for esp testing.
+
+Node.js implementation of echo server.

test/backend/echo/echo.js

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+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// 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.
+//
+////////////////////////////////////////////////////////////////////////////////
+//
+// An example implementation of Echo backend.
+
+"use strict";
+
+var http = require('http');
+var server = http.createServer();
+
+var totalReceived = 0;
+var totalData = 0;
+
+server.on('request', function(req, res) {
+  totalReceived += 1;
+  var method = req.method;
+  var url = req.url;
+  if (method == 'GET' && url == '/version') {
+      res.writeHead(200, {"Content-Type": "application/json"});
+      res.write('{"version":"${VERSION}"}');
+      res.end();
+      return;
+  }
+  req.on('data', function(chunk) {
+    totalData += chunk.length;
+    res.write(chunk);
+  })
+  req.on('end', function() {
+    res.end();
+  });
+
+  var cl = req.headers['content-length'];
+  var ct = req.headers['content-type'];
+
+  var headers = {};
+  if (cl !== undefined) {
+    headers['Content-Length'] = cl;
+  }
+  if (ct !== undefined) {
+    headers['Content-Type'] = ct;
+  }
+
+  res.writeHead(200, headers);
+  req.resume();
+});
+
+var totalConnection = 0;
+
+server.on('connection', function(socket) {
+  totalConnection += 1;
+});
+
+setInterval(function() {
+  console.log("Requests received:", totalReceived, " Data: ", totalData, " Connection: ", totalConnection);
+}, 1000);
+
+var port = process.env.PORT || 8080;
+
+server.listen(port, function() {
+  console.log('Listening on port', port);
+});

test/backend/echo/package.json

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+{
+  "name": "echo",
+  "version": "8.8.1",
+  "description": "An echo server.",
+  "main": "echo.js",
+  "readme": "README.md",
+  "scripts": {
+    "start": "node echo.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/istio/proxy"
+  },
+  "license": "Apache-2.0",
+  "engines" : {
+    "node" : ">=4.1.2"
+  },
+  "files": [
+    "README.md",
+    "echo.js"
+  ]
+}