RFR (XXS) JDK-8150984 Invalid VM argument causes crash -XX:G1ConcRefinementServiceIntervalMillis=2147483648

[Joseph Provino]

Please review this simple fix to prevent arguments from being set to 
negative values.

Webrev:  http://cr.openjdk.java.net/~jprovino/8150984/webrev.00

CR: JDK-8150984  Invalid VM argument causes crash 
-XX:G1ConcRefinementServiceIntervalMillis=2147483648 
<https://bugs.openjdk.java.net/browse/JDK-8150984>

Thanks.

joe
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