Refactor the test code, Add index scan sql coverage test cases.
Merge branch 'release-3.7' of github.com:VoltDB/voltdb into ENG-5297-reversescan-tests
Fix the typo according to Paul's review
Make the sql coverage test more conviencible
Fix the typos
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-5297-reversescan-tests
Merge pull request #882 from VoltDB/ENG-5297-reversescan-tests

Eng 5297 reversescan tests