[9] RFR JDK-8174720: [TEST_BUG] add :open to a @modules annotation for bug7089914.java

[Prasanta Sadhukhan]

Hi All,

Please review a simple fix to add "open" to module to aid jigsaw 
accessibility.
Bug: https://bugs.openjdk.java.net/browse/JDK-8174720
webrev: http://cr.openjdk.java.net/~psadhukhan/8174720/webrev.00/
Regards
Prasanta