ENG-4881 Hashinator save/restore working with test.
ENG-4881 Merged from elastic and resolved conflicts.
ENG-4881 Fix pro build.
ENG-4881 Fix legacy mode.
Merge remote-tracking branch 'origin/elastic' into ENG-4881
ENG-4881 Review changes.
ENG-4881 Review changes 2.
ENG-4881 Unused import.
Merge pull request #782 from VoltDB/ENG-4881

ENG-4881 Save/Restore hashinator