reduplicate node-inspetor network agent bug: injection of network agent cause EventEmitter memory leak.

client.js

'use strict';
// use node-debug to run client.js and observe the memory useage. 

var http = require('http');
var keepAliveAgent = new http.Agent({keepAlive: true, maxSockets: 500});

var list = [];
for (var i = 0; i < 500; i++) {
  list.push("hello world");
}
var data = list.join('');
list = null;

setInterval(function(){
  var result = {};
  var clientReq = http.request({
    host: '127.0.0.1',
    port: 4444,
    path: '/',
    agent: keepAliveAgent,
    headers: {
      'Content-Length': data.length
    }
  }, function(resp) {
    result['body'] = [];
    resp.on('data', function(chunk){
      result['body'].push(chunk);
    });
    resp.on('end', function(){
      result['body'] = Buffer.concat(result['body']);
    })
  });
  clientReq.end(data);
  clientReq.on('error', function(err){
    console.error('error ', err, err.stack);
  })
}, 100);

setInterval(function(){
  console.log('## MEM ', process.memoryUsage());
}, 1000);

server.js

'use strict';
// use node to run server.js as normal.

var http = require('http');

var list = [];
for (var i = 0; i < 500; i++) {
  list.push("node-inspector/node-inspector")
}
var data = list.join('');
list = null;

var server = http.createServer(function(req, res){
  var body = [];
  req.on('data', function(chunk){
    body.push(chunk);
  });
  req.on('end', function(){
    body = Buffer.concat(body);
    setTimeout(function(){
      res.writeHead(200, {'Content-Length': data.length}, 'OK');
      res.write(data);
      res.end();
    }, 100);
  });
});
server.listen(4444);

setInterval(function(){
  console.log('## MEM ', process.memoryUsage());
}, 1000);