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

[Chris Yin]

Please have a review to new webrev as below, some code refactoring on lib parts and enhanced DNSServer to handle retry request which will make the tests more stable, thanks

http://cr.openjdk.java.net/~xyin/8198882/webrev.01/ <http://cr.openjdk.java.net/~xyin/8198882/webrev.01/>

Regards,
Chris

> On 22 Mar 2018, at 11:16 AM, Chris Yin <xu.y.yin at oracle.com> wrote:
> 
> 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