RFR (S) 8216352: SA: ClhsdbLauncher should throw errors on Unrecognized commands

[Fairoz Matte]

Hi,

Please review a tiny change to handle unrecognized command options for 
ClhsdbLauncher test.
This patch is already proposed by Gary Adams in comments section.

JBS: https://bugs.openjdk.java.net/browse/JDK-8216352
Webrev: http://cr.openjdk.java.net/~fmatte/8216352/webrev.00/

Thanks,
Fairoz