[9] RfR: 8177428: [test] Ensemble cannot play AudioClip files when running in Java 8 and hosted over http

[David DeHaven]

Kevin, please review this fix for the Ensemble test app. The bug affects JDK 8 
so will need to be back ported.

JBS issue:
https://bugs.openjdk.java.net/browse/JDK-8177428

Webrev:
http://cr.openjdk.java.net/~ddehaven/8177428/rt.v0/

-DrD-