ENG-5255: Make the examples print out a brief description of the
VoltDB operations they're performing and the command lines used to
accomplish them.
- Tell the user when the voltdb script isn't in their path.
- Monkey with the paths to make them look cleaner.
Merge pull request #877 from VoltDB/eng5255

ENG-5255
Merge branch 'master' into ENG-5285-rework-export-test