For ENG-6209, add logging to give more visiblity into auto-snapshot activity and fix a bug where failed snapshot initiations don't end up invoking an error callback
Change timestamp format for voltkvqa client.
Merge pull request #1316 from VoltDB/ENG-6209

For ENG-6209, add logging to give more visiblity into auto-snapshot acti...
V4.3
Merge branch 'master' into ENG-6220