Fix of pool leaking by TCP-keepalive (#918)

* fix of bug with pool leaking by TCP keep-alives

* add test for check setKeepAlive on connect

* fix mistake with var

* fix mistake with var

lib/connection.js

@@ -48,6 +48,7 @@ Connection.prototype.connect = function(port, host) {
 
   this.stream.on('connect', function() {
     self.emit('connect');
+    self.stream.setKeepAlive(true);
   });
 
   this.stream.on('error', function(error) {

test/unit/connection/startup-tests.js

@@ -43,6 +43,18 @@ test('using closed stream', function() {
     assert.ok(hit);
 
   });
+
+  test('after stream emits connected event init TCP-keepalive', function() {
+
+    var res = false;
+
+    stream.setKeepAlive = function(bit) {
+      res = bit;
+    };
+
+    assert.ok(stream.emit('connect'));
+    assert.equal(res, true);
+  });
 });
 
 test('using opened stream', function() {

test/unit/test-helper.js

@@ -15,6 +15,8 @@ p.write = function(packet) {
   this.packets.push(packet);
 };
 
+p.setKeepAlive = function(){};
+
 p.writable = true;
 
 createClient = function() {