UniversalCompaction should ignore sorted runs being compacted (when compacting for file num)
Summary: If we have total number of sorted runs greater than level0_file_num_compaction_trigger, Universal compaction will always issue a compaction even if the number of sorted runs that are not being compacted is less than level0_file_num_compaction_trigger. This diff changes this behaviour to relay on the `number of sorted runs not being compacted` instead of `total number of sorted runs` Test Plan: New unit test Reviewers: sdong Reviewed By: sdong Subscribers: andrewkr, dhruba Differential Revision: https://reviews.facebook.net/D61533
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