Time out and clean up udp stopped messages

This solves one of the problems with the bittorrent-client tests
not exiting

Author: jhiesey

index.js

@@ -172,15 +172,16 @@ Tracker.prototype._requestUdp = function (requestUrl, opts) {
   var socket = dgram.createSocket('udp4')
   var transactionId = new Buffer(hat(32), 'hex')
 
-  if (opts.event !== 'stopped') {
-    // if we're sending a stopped message, we don't really care if it arrives, so don't
-    // set a timer
-    var timeout = setTimeout(function () {
-      timeout = null
-      cleanup()
+  var stopped = opts.event === 'stopped'
+  // if we're sending a stopped message, we don't really care if it arrives, so set
+  // a short timer and don't call error
+  var timeout = setTimeout(function () {
+    timeout = null
+    cleanup()
+    if (!stopped) {
       error('tracker request timed out')
-    }, 15000)
-  }
+    }
+  }, stopped ? 1500 : 15000)
 
   if (timeout && timeout.unref) {
     timeout.unref()