ENG-4681 VoltDB daemonization support.
ENG-4681 Don't delete output files too soon.
ENG-4681 Fixed keyword in comment.
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-4681
ENG-4681 Remove exporttofile.py based on review comment.
ENG-4681 Fix license.
ENG-4681 Merge from master.
Merge pull request #993 from VoltDB/ENG-4681

ENG-4681 VoltDB daemonization support.