Connection: fix destroy()

lib/Connection.js

@@ -231,13 +231,15 @@ Connection.prototype.serverSupports = function(cap) {
 Connection.prototype.destroy = function() {
   this._queue = [];
   this._curReq = undefined;
-  this._sock.end();
+  this._sock.destroy();
 };
 
 Connection.prototype.end = function() {
   var self = this;
   this._enqueue('LOGOUT', function() {
-    self.destroy();
+    self._queue = [];
+    self._curReq = undefined;
+    self._sock.end();
   });
 };