[12] RFR 8208279: Add 8 JNDI tests to com/sun/jndi/dns/EnvTests/

[Chris Yin]

Please review the changes to add another 8 JNDI tests to 
com/sun/jndi/dns/EnvTests/ in OpenJDK, thanks

bug: https://bugs.openjdk.java.net/browse/JDK-8208279 
<https://bugs.openjdk.java.net/browse/JDK-8208279>
webrev: http://cr.openjdk.java.net/~xyin/8208279/webrev.00/ 
<http://cr.openjdk.java.net/~xyin/8208279/webrev.00/>

Regards,
Chris