Master: fixed failed test cases in DbMonitorTest
Master: fixed failed test cases in DbMonitorTest

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