(XS) RFR: 8143836: [TESTBUG] runtime/CommandLine/IgnoreUnrecognizedVMOptions fails in jdk9/dev

[David Holmes]

Bug: https://bugs.openjdk.java.net/browse/JDK-8143836

webrev: http://cr.openjdk.java.net/~dholmes/8143836/webrev/

The UnlockCommercialFeatures flag shouldn't be tested in open tests as 
it doesn't exist in OpenJDK builds.

Thanks,
David
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