update safe shutdown message (#3937)
update safe shutdown message (#3937)


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