add direct_io and compaction_readahead_size in db_stress #1906
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add direct_io and compaction_readahead_size in db_stress
test direct_io under db_stress with compaction_readahead_size enabled to capture bugs found in production.
./db_stress --allow_concurrent_memtable_write=0 --use_direct_reads --use_direct_writes --compaction_readahead_size=4096