RFR 8222098: tools/jlink/plugins/IncludeLocalesPluginTest.java time out

[sundararajan . athijegannathan]

Please review.

Not really a fix - but increasing the default timeout for the test.

Bug: https://bugs.openjdk.java.net/browse/JDK-8222098

Webrev: http://cr.openjdk.java.net/~sundar/8222098/webrev.00/

Thanks,

-Sundar