ENG-4572: Port runtime-modifiable heartbeat timeout change to master, part 1.  This half would allow the setting to be updated if it made it through the catalog diff whitelist.  That change is in the pro repo.
ENG-4572: Port runtime-modifiable heartbeat timeout change to master,
part 1.  This half would allow the setting to be updated if it made it
through the catalog diff whitelist.  That change is in the pro repo.

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