Need to clear and update the set of leaders both on startup and on leader failure.
Need to clear and update the set of leaders both on startup and on
leader failure.

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