test: changed assert.Equal to asset.strictEqual

test-dgram-send-callback-recursive.js

PR-URL: nodejs#9973
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

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

@@ -37,7 +37,7 @@ client.on('message', function(buf, info) {
 });
 
 client.on('close', common.mustCall(function() {
-  assert.equal(received, limit);
+  assert.strictEqual(received, limit);
 }));
 
 client.bind(0);