Enable testing CompactFiles in db_stress
Summary: Enable testing CompactFiles in db_stress by adding flag test_compact_files to db_stress. Test Plan: ./db_stress --test_compact_files=1 --compaction_style=0 --allow_concurrent_memtable_write=false --ops_per_thread=100000 ./db_stress --test_compact_files=1 --compaction_style=1 --allow_concurrent_memtable_write=false --ops_per_thread=100000 Sample output (note that it's normal to have some CompactFiles() failed): Stress Test : 491.891 micros/op 65054 ops/sec : Wrote 21.98 MB (0.45 MB/sec) (45% of 3200352 ops) : Wrote 1440728 times : Deleted 441616 times : Single deleted 38181 times : 319251 read and 19025 found the key : Prefix scanned 640520 times : Iterator size sum is 9691415 : Iterated 319704 times : Got errors 0 times : 1323 CompactFiles() succeed : 32 CompactFiles() failed 2016/04/11-15:50:58 Verification successful Reviewers: sdong, IslamAbdelRahman, kradhakrishnan, yiwu, andrewkr Reviewed By: andrewkr Subscribers: andrewkr, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D56565
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