RFR(XS): 8056263 [TESTBUG] Re-enable NMTWithCDS.java test

[George Triantafillou]

Please review this updated test for 8056263.  Prior to the promotion of 
the java launcher changes, the test was failing in JPRT.  The test is 
now enabled.

Webrev: http://cr.openjdk.java.net/~gtriantafill/8056263/webrev/ 
<http://cr.openjdk.java.net/%7Egtriantafill/8056263/webrev/>
Bug: https://bugs.openjdk.java.net/browse/JDK-8056263

The fix was tested locally on Linux with jtreg.

Thanks.

-George