RFR(S): JDK-8055684: runtime/NMT/CommandLineEmptyArgument.java fails

[George Triantafillou]

Please review this test fix for 8055684.  The nightly for 2014-08-13 was 
the only build that failed.  The @ignore tag was removed to enable this 
test.

Webrev: 
http://http://cr.openjdk.java.net/~gtriantafill/8055684.webrev/webrev/ 
<http://http://cr.openjdk.java.net/%7Egtriantafill/8055684.webrev/webrev/>
Bug: https://bugs.openjdk.java.net/browse/JDK-8055684

The fix was tested locally on Linux.

Thanks.

-George