Connection: don't disable keepalive timer on socket 'error'

lib/Connection.js

@@ -131,7 +131,6 @@ Connection.prototype.connect = function() {
   this._onError = function(err) {
     clearTimeout(self._tmrConn);
     clearTimeout(self._tmrAuth);
-    clearTimeout(self._tmrKeepalive);
     self.debug && self.debug('[connection] Error: ' + err);
     err.source = 'socket';
     self.emit('error', err);