RFR 8198882: Add 10 JNDI tests to com/sun/jndi/dns/AttributeTests/

Please review the changes to add 10 JNDI tests to com/sun/jndi/dns/AttributeTests/, thanks bug: https://bugs.openjdk.java.net/browse/JDK-8198882 <https://bugs.openjdk.java.net/browse/JDK-8198882> webrev: http://cr.openjdk.java.net/~xyin/8198882/webrev.00/ <http://cr.openjdk.java.net/~xyin/8198882/webrev.00/> Regards, Chris