Support Node.js 10 (ldapjs#497)

* Support node 10

* remove arrow function

lib/client/client.js

@@ -1111,6 +1111,12 @@ Client.prototype.connect = function connect() {
     socket.once('error', bail);
     socket.once('end', bail);
     socket.once('timeout', bail);
+    socket.once('cleanupSetupListeners', function onCleanup() {
+      socket.removeListener('error', bail)
+        .removeListener('close', bail)
+        .removeListener('end', bail)
+        .removeListener('timeout', bail);
+    });
 
     self._socket = socket;
     self._tracker = tracker;
@@ -1147,10 +1153,8 @@ Client.prototype.connect = function connect() {
 
   // Wire up "official" event handlers after successful connect/setup
   function postSetup() {
-    socket.removeAllListeners('error')
-      .removeAllListeners('close')
-      .removeAllListeners('end')
-      .removeAllListeners('timeout');
+    // cleanup the listeners we attached in setup phrase.
+    socket.emit('cleanupSetupListeners');
 
     // Work around lack of close event on tls.socket in node < 0.11
     ((socket.socket) ? socket.socket : socket).once('close',