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
Correction to tools/demo instructions

Need to cd to voter or voltkv directory before running ./run.sh because
srccompile uses relative paths.
Merge remote-tracking branch 'origin/master' into uac-fixes
Roll back extra debugging.