Restore lazy-socket's ability to reconnect on terminated connections

lib/LazySocket.js

@@ -8,6 +8,7 @@ function LazySocket(properties) {
   this.host = properties.host;
 
   this._socket    = null;
+  this._closed = false;
   this._callbacks = [];
 }
 
@@ -57,15 +58,28 @@ LazySocket.prototype._lazyConnect = function() {
     });
   }
 
+  function onend() {
+    // "end" is called when the socket connection is terminated, regardless of the termination being unexpected or not
+    // to distinguish between unexpected terminations (e.g need reconnection)
+    // from expected terminations (e.g calling LazySocket's .end() or .destroy()), the later are flagged as "closed"
+
+    if (!self._closed) {
+      self._socket = null;
+    }
+  }
+
   this._socket = net
     .createConnection(this.port, this.host)
-    .once('error', onerror);
+    .once('error', onerror)
+    .once('end', onend);
 };
 
 LazySocket.prototype.end = function() {
+  this._closed = true;
   if (this._socket) this._socket.end();
 };
 
 LazySocket.prototype.destroy = function() {
+  this._closed = true;
   if (this._socket) this._socket.destroy();
 };