RFR(XS) 8243206: Cleanup error checking and handling in serviceability/sa/JhsdbThreadInfoTest.java

[Chris Plummer]

Hello,

Please review the following simple fixes to JhsdbThreadInfoTest.java. 
Details are in the CR description.

https://bugs.openjdk.java.net/browse/JDK-8243206
http://cr.openjdk.java.net/~cjplummer/8243206/webrev.00/

thanks,

Chris