ENG-6301 fix undo with prior duplicate rows inserted.
Merge branch 'master' into ENG-6301-bulk-loader-crash
ENG-6301 add ee test for undo of inserted duplicates
ENG-6300 use persistent sequential nodes for truncation snapshot requests
Merge pull request #1361 from VoltDB/ENG-6301-bulk-loader-crash

Eng 6301 bulk loader crash
Merge pull request #1374 from VoltDB/ENG-6300-II

ENG-6300 use persistent sequential nodes for truncation snapshot requests