ENG-8426: make some new vars private.
ENG-8426: make some new vars private.

per Chris Wolff's review.

VoltDB/voltdb,simonzhangsm/voltdb,migue/voltdb,VoltDB/voltdb,migue/voltdb,deerwalk/voltdb,paulmartel/voltdb,VoltDB/voltdb,deerwalk/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,deerwalk/voltdb,paulmartel/voltdb,paulmartel/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,paulmartel/voltdb,VoltDB/voltdb,VoltDB/voltdb,migue/voltdb,VoltDB/voltdb,paulmartel/voltdb,deerwalk/voltdb,paulmartel/voltdb,deerwalk/voltdb,migue/voltdb,paulmartel/voltdb,deerwalk/voltdb,migue/voltdb,simonzhangsm/voltdb,deerwalk/voltdb,deerwalk/voltdb,simonzhangsm/voltdb,migue/voltdb,simonzhangsm/voltdb,migue/voltdb,VoltDB/voltdb,migue/voltdb,paulmartel/voltdb