Storage code specially handles "snapshot too old" because it's an expected error that queries can race with. In those cases, WT will also log a message.
However, that message is logged by MongoDB as an error which is not ideal.
- depends on
WT-4844 Only log an informational message when a set read-timestamp is older than the oldest timestamp.
- is duplicated by
SERVER-38871 suppress or alter E error message when attempting to read at a time earlier than oldest timestamp