Clean up vault directory before running test

Hopefully this will fix the intermittent failure in the vault tests
Fix the checkstyle config to avoid problems with broken RedundantThrowsCheck
Merge pull request #6645 from bstansberry/fix-checkstyle

Fix the checkstyle config to avoid problems with broken RedundantThrowsC...
Merge pull request #6640 from stuartwdouglas/jms-intermittent

Clean up vault directory before running test