Fix a bug where Client.drain() would return before the last callbacks had actually been invoked. This is a fix for ENG-667.
Fix a bug where Client.drain() would return before the last callbacks had actually been invoked. This is a fix for ENG-667.

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