RFR(XS): JDK-8054711: [TESTBUG] Enable NMT2 tests after NMT2 is integrated

[George Triantafillou]

Please review this test fix for 8054711.  The @ignore tag has been 
removed in order to enable jtreg runtime tests.

Webrev: http://cr.openjdk.java.net/~gtriantafill/8054711/webrev-00 
<http://cr.openjdk.java.net/%7Egtriantafill/8054711/webrev-00>

Bug: https://bugs.openjdk.java.net/browse/JDK-8054711

The fix was tested with the jtreg hotspot tests.

Thanks.

-George