ACCUMULO-3024 put all VFS caches in their own directory, delete the process-specific directory in the shutdown hook
Merge branch '1.6.1-SNAPSHOT'
ACCUMULO-3024 really delete the directory and any gunk under it
Merge branch '1.6.1-SNAPSHOT'
ACCUMULO-3007 made volume replacement ignore relative paths
Merge branch '1.6.1-SNAPSHOT'