test: loosen condition to detect infinite loop

PR-URL: https://github.com/nodejs/io.js/pull/1857
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

test/parallel/test-dgram-send-callback-recursive.js

@@ -8,7 +8,7 @@ const chunk = 'abc';
 var recursiveCount = 0;
 var received = 0;
 const limit = 10;
-const recursiveLimit = limit + 1;
+const recursiveLimit = 100;
 
 function onsend() {
   if (recursiveCount > recursiveLimit) {