RFR 8198931: remove java.xml.bind module dependency for com/sun/jndi tests

[Chris Yin]

Please review the minor changes to remove java.xml.bind module dependency for com/sun/jndi tests, thanks

bug: https://bugs.openjdk.java.net/browse/JDK-8198931 <https://bugs.openjdk.java.net/browse/JDK-8198931>
webrev: http://cr.openjdk.java.net/~xiaofeya/8198931/webrev.00/ <http://cr.openjdk.java.net/~xiaofeya/8198931/webrev.00/>

Regards,
Chris