Revert "Fix DS-1408 based on hints at http://stackoverflow.com/questions/4162557/timeout-error-trying-to-lock-table-in-h2"

This reverts commit 4f808e72367e821557ba18a3e086b04b3c504db2.
Merge pull request #582 from tdonohue/DS-1408

DS-1408 - revert unnecessary  MVCC setting for H2 database