Fixed some failed test cases in DbMonitorTest
Fixed some failed test cases in DbMonitorTest

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