Add bottommost_compression option
Summary: Add a new option that can be used to set a specific compression algorithm for bottommost level. This option will only affect levels larger than base level. I have also updated CompactionJobInfo to include the compression algorithm used in compaction Test Plan: added new unittest existing unittests Reviewers: andrewkr, yhchiang, sdong Reviewed By: sdong Subscribers: lightmark, andrewkr, dhruba, yoshinorim Differential Revision: https://reviews.facebook.net/D57669
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