additional update to dockerfile to reduce the number of layers
additional update to dockerfile to reduce the number of layers

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