Fix /tmp priv issue with license check
Add new exception class
tweaked messages displayed
ENG-4760: fix other.path.
ENG-4760: add one missing dir, and one comment.
Updates per jhugg review
Merge pull request #712 from VoltDB/ENG-4760

Eng 4760
Merge pull request #709 from VoltDB/ENG-4990

Eng 4990 - When /tmp is not writeable, return a better message during license verification.
Merge remote-tracking branch 'origin/master' into ENG-4939-Index