[test] 8214445 : java/net/URL/HandlerLoop has illegal reflective access

[Roger Riggs]

Please review a test cleanup to remove a latent Illegal Reflective Access.

Adding the @modules was necessary and the code was updated to remove 
compilation warnings.

Webrev:
   http://cr.openjdk.java.net/~rriggs/webrev-handlerloop-8214445/

Jira:
   https://bugs.openjdk.java.net/browse/JDK-8214445

Thanks, Roger