ENG-6358: make sure generation is closed and deleted.
ENG-6358: make sure generation is closed and deleted.

kumarrus/voltdb,creative-quant/voltdb,paulmartel/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,zuowang/voltdb,flybird119/voltdb,deerwalk/voltdb,kumarrus/voltdb,zuowang/voltdb,wolffcm/voltdb,migue/voltdb,flybird119/voltdb,VoltDB/voltdb,simonzhangsm/voltdb,paulmartel/voltdb,ingted/voltdb,wolffcm/voltdb,zuowang/voltdb,wolffcm/voltdb,kumarrus/voltdb,wolffcm/voltdb,zuowang/voltdb,zuowang/voltdb,kumarrus/voltdb,creative-quant/voltdb,paulmartel/voltdb,migue/voltdb,kumarrus/voltdb,deerwalk/voltdb,ingted/voltdb,migue/voltdb,paulmartel/voltdb,flybird119/voltdb,paulmartel/voltdb,simonzhangsm/voltdb,creative-quant/voltdb,VoltDB/voltdb,VoltDB/voltdb,VoltDB/voltdb,creative-quant/voltdb,ingted/voltdb,simonzhangsm/voltdb,deerwalk/voltdb,simonzhangsm/voltdb,kumarrus/voltdb,deerwalk/voltdb,paulmartel/voltdb,flybird119/voltdb,migue/voltdb,ingted/voltdb,creative-quant/voltdb,flybird119/voltdb,paulmartel/voltdb,flybird119/voltdb,deerwalk/voltdb,migue/voltdb,VoltDB/voltdb,deerwalk/voltdb,migue/voltdb,zuowang/voltdb,flybird119/voltdb,deerwalk/voltdb,deerwalk/voltdb,ingted/voltdb,creative-quant/voltdb,zuowang/voltdb,flybird119/voltdb,wolffcm/voltdb,migue/voltdb,creative-quant/voltdb,kumarrus/voltdb,ingted/voltdb,zuowang/voltdb,wolffcm/voltdb,creative-quant/voltdb,paulmartel/voltdb,VoltDB/voltdb,ingted/voltdb,wolffcm/voltdb,VoltDB/voltdb,kumarrus/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,wolffcm/voltdb,migue/voltdb,ingted/voltdb