Add support for in place update for db_stress
Summary: Added two flags which operate as follows: in_place_update: enable in_place_update for default column family set_in_place_one_in: toggles the value of the option inplace_update_support with a probability of 1/N Test Plan: Run db_stress with the two flags above set. Specifically tried in_place_update set to true and set_in_place_one_in set to 10,000. Reviewers: ljin, igor, sdong Reviewed By: sdong Subscribers: dhruba, leveldb Differential Revision: https://reviews.facebook.net/D28029
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