ENG-5575: Log the snapshot request response if retry fails.
Experiment with doing ZK reads locally without agreement
Fix failure to fall through to default handling when short circuit is not appropriate.
Remove duplicate if/else block
Merge pull request #1005 from VoltDB/zk_shortcircuit

Zk shortcircuit, do reads locally where possible
Merge pull request #1004 from VoltDB/ENG-5575

ENG-5575: Log the snapshot request response if retry fails.