Nhat Nguyen 05bf9dc2e8
Add contains method to LocalCheckpointTracker ()
This change adds "contains" method to LocalCheckpointTracker.
One of the use cases is to check if a given operation has been processed
in an engine or not by looking up its seq_no in LocalCheckpointTracker.

Relates 
2018-09-19 20:29:36 -04:00
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