ENG-4191: Make the masters needed for restart thread-safe.
ENG-4191: Make the masters needed for restart thread-safe.

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