Merge pull request #817 from VoltDB/ENG-4625-change-catalog

[release-3.7] Eng 4625 change catalog
Remove useless order by for unique row result
Fix the failed test cases
txnid2: add mpratio workload mix option
Merge pull request #826 from VoltDB/ENG-5241-remove-orderby

Eng 5241 remove orderby
Merge pull request #832 from VoltDB/release-3.7

Merge release-3.7 to master