ENG-12560 fix a JUnit that fails when tests get run out of order. (#4553)
ENG-12560 fix a JUnit that fails when tests get run out of order. (#4553)

One test assumes there is no voltdbroot in the directory. This was fine when there was only one test but has not been true since 'init --schema' was added.
VoltDB/voltdb,VoltDB/voltdb,simonzhangsm/voltdb,deerwalk/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,VoltDB/voltdb,simonzhangsm/voltdb,deerwalk/voltdb,deerwalk/voltdb,simonzhangsm/voltdb,VoltDB/voltdb,deerwalk/voltdb,simonzhangsm/voltdb,deerwalk/voltdb,deerwalk/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,deerwalk/voltdb,deerwalk/voltdb,VoltDB/voltdb,VoltDB/voltdb,VoltDB/voltdb