test: fix async-listener-run-error-once

Rely on defined order of operations by closing the server and
destorying the client socket, instead of when setImmediate fires

test/simple/test-asynclistener-run-error-once.js

@@ -24,11 +24,13 @@ var assert = require('assert');
 var net = require('net');
 var tracing = require('tracing');
 
+var errMsg = 'net - error: server connection';
 var cntr = 0;
 var al = tracing.addAsyncListener({
   error: function(stor, er) {
     cntr++;
     process._rawDebug('Handling error: ' + er.message);
+    assert.equal(errMsg, er.message);
     return true;
   }
 });
@@ -36,21 +38,22 @@ var al = tracing.addAsyncListener({
 process.on('exit', function(status) {
   tracing.removeAsyncListener(al);
 
+  console.log('exit status:', status);
   assert.equal(status, 0);
+  console.log('cntr:', cntr);
   assert.equal(cntr, 1);
   console.log('ok');
 });
 
 
 var server = net.createServer(function(c) {
-  throw new Error('net - error: server connection');
+  this.close();
+  throw new Error(errMsg);
 });
 
 
 server.listen(common.PORT, function() {
   net.connect(common.PORT, function() {
-    setImmediate(function() {
-      process.exit();
-    });
+    this.destroy();
   });
 });