minor improvements to db_stress
Summary: fix some things that made this command hard to use from CLI: - use default values for `target_file_size_base` and `max_bytes_for_level_base`. previously we were using small values for these but default value of `write_buffer_size`, which led to enormous number of L1 files. - failure message for `value_size_mult` too big. previously there was just an assert, so in non-debug mode it'd overrun the value buffer and crash mysteriously. - only print verification success if there's no failure. before it'd print both in the failure case. - support `memtable_prefix_bloom_size_ratio` - support `num_bottom_pri_threads` (universal compaction) Closes https://github.com/facebook/rocksdb/pull/2741 Differential Revision: D5629495 Pulled By: ajkr fbshipit-source-id: ddad97d6d4ba0884e7c0f933b0a359712514fc1d
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