Unrelated, add alternative to MoreExecutors.sameThreadExcutor which allocates a new executor that does locking itnernally
For ENG-6115, clean up various stream snapshot error messages
Unrelated, add missing always pretouch flag to default case
For ENG-6226, remove stack trace to console on cancelled key exception
Don't log in community that we can't load a pro class like SnapshotIOAgentImpl
For ENG-6227, don't log a scary warning a snapshots collide
Unrelated, use CoreUtils.SAMETHREADEXECUTOR instead of MoreExecutors.SameThreadExecutor because it doesn't do any allocations and synchronization
For ENG-6115, cleanup based on Stefano's feedback
Merge pull request #1400 from VoltDB/ENG-6115

Eng 6115 Tweak a bunch of error logging and clean up some unrelated things