I can't reproduce ENG-3985, so adding some defensive code.
Wrap both crashVoltDB calls in try/finally blocks that hopefully ensure death.
ENG-3985: Fix broken test code by my DIE DIE DIE choices.
Merge pull request #398 from VoltDB/ENG-3985-diehard

Eng 3985 diehard - Extra protection to ensure CrashVoltDB actually crashes