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 "Log every 10 seconds you don't hear from a foreign host"
to master.
ENG-4572: Fix licenses for licensecheck
Merge pull request #465 from VoltDB/eng4572

ENG-4572: porting heartbeat timeout configuration to master